Publications/Presentations

In the following list you find our publications of the last years grouped by year of appearance and sorted alphabetical per year.

Can Türker, Klaus Haller, Christoph Schuler, Hans-Jörg Schek: How can we support Grid Transactions? Towards Peer-toPeer Transaction Porcessing. In: Proceedings of the 2005 CIDR conference, Asilomar, CA, USA, January 2005.

Klaus Haller, Heiko Schuldt, Can Türker: A Fully Decentralized Approach to Coordinating Transactional Processes in Peer-to-Peer Environments. Technical Report Number 463, ETH-Zentrum, CH-8092 Zürich, Switzerland, October 2004.

W. Binder and I. Constantinescu and B. Faltings and K. Haller and C. Türker: A Multi-Agent System for the Reliable Execution of Automatically Composed Ad-hoc Processes. In: Second European Workshop on Multi-Agent Systems (EUMAS), Barcelona, Spain, december 2004.

Walter Binder, Ion Constantinescu, Boi Faltings, Klaus Haller, and Can Türker: Automated Composition and Reliable Execution of Ad-hoc Processes. In: Second European Workshop on Multi-Agent Systems (EUMAS), Barcelona, Spain, december 2004.

Klaus Haller, Michelle Ackermann, Claudio Munari, Can Türker: Enhanced User Support for Mobile Ad-hoc-Processes. Beitragsband zum Workshop Grundlagen und Anwendungen mobiler Informationstechnologie, Fakultät für Informatik, Universität Magdeburg, March 2004.

F. Akal, C. Türker, H.-J. Schek, T. Grabs, Y. Breitbart: Fine-Grained Lazy Replication with Strict Freshness and Correctness Guarantees. Technical Report Number 457, ETH-Zentrum, CH-8092 Zürich, Switzerland, september 2004.

M. Mlivoncic, C. Schuler, C. Türker: Hyperdatabase Infrastructure for Management and Search of Multimedia Collections. Digital Library Architectures: Peer-to-Peer, Grid, and Service-Orientation, Proc. of the Sixth Thematic Workshop of the EU Network of Excellence DELOS on Digital Library Architectures, S. Margherita di Pula (Cagliari), Italy, June 2004.

H.­J. Schek, H. Schuldt, C. Schuler, C. Türker, R. Weber: Hyperdatenbanken zur Verwaltung von Informationsräumen. it - Information Technology, Heft 2, Seiten 67-75, http://www.it-inftech.de, Februar 2004.

T. Grabs, K. Böhm, H.­J. Schek: PowerDB-IR - Scalable Information Retrieval and Storage with a Cluster of Databases. In: Knowledge and Information Systems (2004) 6: 465-505 ISSN : 0219-1377 (Paper) 0219-3116 (Online) Link : http://dx.doi.org/10.1007/s10115-003-0120-y, Springer-Verlag London Ltd. 2004, July 2004.

C. Schuler, R. Weber, H. Schuldt, H.­J. Schek: Scalable Peer-to-Peer Process Management The OSIRIS Approach. In: Proc. of IEEE International Conference on Web Services ICWS), San Diego, California, USA, July 2004.

Can Türker, Gabriele Zini: A Survey of Academic and Commercial Approaches to Transaction Support in Mobile Computing Environments. Technical Report Number 429, ETH-Zentrum, CH-8092 Zürich, Switzerland, Nov 2003.

M. Mlivoncic, R. Weber: A filter and refinement approach to RBIR. DELOS Workshop on Multimedia Contents in Digital Libraries, Chania, Crete, Greece , June 2003.

R. Weber, M.Mlivoncic: Efficient Region-Based Image Retrieval. 12th International Conference on Information and Knowledge Management (CIKM'03), New Orleans, LA, USA, November 2003.

T. Grabs, H.­J. Schek: Flexible Information Retrieval on XML Documents. In: Intelligent Search on XML Data: Applications, Languages, Models, Implementations, and Benchmarks, Springer Verlag, Berlin, ISBN: 3540407685, 2003.

H. Blanken, T. Grabs, H.­J. Schek, R. Schenkel, G. Weikum: Intelligent Search on XML Data: Applications, Languages, Models, Implementations, and Benchmarks. Springer Verlag, Berlin, ISBN: 3540407685, 2003.

C. Türker, K. Haller, H. Schuldt, H.-J. Schek: Mobilitätsaspekte in Informationsräumen. In: Erscheint in Datenbank-Spektrum, dpunkt Verlag, 2003.

C. Schuler, R. Weber, H. Schuldt, H.­J. Schek: Peer-to-Peer Process Execution with OSIRIS. In: Proc. of 1th International Conference on Service Oriented Computing (to appear), Trento - Italy, December 15-18 2003.

C. Türker: SQL:1999 & SQL:2003 - Objektrelationales SQL, SQLJ & SQL/XML. ISBN 3-89864-219-4, dpunkt-Verlag, Heidelberg, 2003.

T. Grabs, H.-J. Schek: Scalable XML Processing with a Database Cluster. In: Intelligent Search on XML Data: Applications, Languages, Models, Implementations, and Benchmarks, Springer Verlag, Berlin, ISBN: 3540407685, 2003.

K. Haller, H. Schuldt, H.-J. Schek: Transactional Peer-to-Peer Information Processing: The AMOR Approach. 4th International Conference on Mobile Data Management (MDM2003), Melbourne, Australia, January 2003.

R. Weber: Using Relevance Feedback in XML Retrieval. In: Intelligent Search on XML Data: Applications, Languages, Models, Implementations, and Benchmarks, Springer Verlag, Berlin, ISBN: 3540407685, 2003.

R. Weber, C. Schuler, H. Schuldt, H.-J. Schek, P. Neukomm: WebService Composition with O'GRAPE and OSIRIS . Proc. of 29th International Conference on Very Large Data Bases (to appear), Berlin, Germany, September 2003.

H. Schuldt, G. Alonso, C. Beeri, H.-J. Schek: Atomicity and Isolation for Transactional Processes. To appear in: ACM Transactions on Database Systems (TODS) 27(1), March 2002.

T. Grabs, K. Böhm, H.-J. Schek: Efficient Transaction Management for XML Documents. Eleventh International Conference on Information and Knowledge Management (ACM CIKM 2002), McLean, VA, USA, 2002.

U. Röhm, K. Böhm, H.-J. Schek, H. Schuldt: FAS - A Freshness-Sensitive Coordination Middleware for a Cluster of OLAP Components. In: Proceedings of the 28th International Conference on Very Large Data Bases (VLDB2002), Hong Kong, China, August 20-23 2002.

T. Grabs, H.-J. Schek: Generating Vector Spaces On-the-fly for Flexible XML Retrieval. In: Proceedings of the XML and Information Retrieval Workshop - 25th Annual International ACM SIGIR Conference on Research and Development in Information Retrieval, Tampere, Finland, August 2002.

H.-J. Schek, H. Schuldt, R. Weber: Hyperdatabases - Infrastructure for the Information Space. In: Advances in Visual Database Systems - Proceedings of the 6th IFIP 2.6 Working Conference on Visual Database Systems (VDB'02), Brisbane, Australia, May 2002.

C. Türker, H.-J. Schek: Hyperdatenbank-Infrastruktur für dynamische Informationsräume (Kurzbeschreibung). In: Informatik bewegt, Informatik 2002 --- 32. GI-Jahrestagung, Dortmund, Oktober 2002.

H.-J. Schek and H. Schuldt and C. Schuler and R. Weber: Infrastructure for Information Spaces. In: Proceedings of the 6. East-European Conference on Advances in Databases and Information Systems (ADBIS'2002), Bratislava, Slovakia, September 2002.

F. Akal and K. Böhm and H.-J. Schek: OLAP Query Evaluation in a Database Cluster: a Performance Study on Intra-Query Parallelism. In: Proceedings of the 6. East-European Conference on Advances in Databases and Information Systems (ADBIS'2002), Bratislava, Slovakia, September 2002.

C. Schuler, H. Schuldt: OSIRIS Eine generische Plattform für die verteilte Ausführung von Geschäftsprozessen. 14. GI-Workshop Grundlagen von Datenbanken, Fischland/Darss, Deutschland, May 2002.

C. Türker: SQL:2003 --- Was dürfen wir erwarten?. In: Datenbank-Spektrum, dpunkt Verlag, 2002.

M. Mlivoncic and K. Böhm and R. Weber: Ähnlichkeitsanfragen unter Verwendung von Bildmerkmalen und Text. In: 14. GI-Workshop "Grundlagen von Datenbanken", Fischland/Darß, Deutschland, May 2002.

U. Röhm, K. Böhm, H.-J. Schek: Cache-Aware Query Routing in a Cluster of Databases. In: Proceedings of the 17th International Conference on Data Engineering (ICDE2001), Heidelberg, Germany, April 2-6 2001.

K. Böhm, M. Mlivoncic, H.-J. Schek, R. Weber: Fast Evaluation Techniques for Complex Similarity Queries. 27th Int. Conf. on Very Large Databases (VLDB), Roma, Italy, September 2001.

T. Grabs, K. Böhm, H.-J. Schek: High-level Parallelisation in a Database Cluster: a Feasibility Study Using Document Services. In: Proceedings of the 17th International Conference on Data Engineering (ICDE2001), Heidelberg, Germany, April 2-6 2001.

A. Naef, C. Schuler, H. Schuldt: Monitoring komplexer Dienste in unternehmensübergreifenden Prozesse am Beispiel von SAP R/3 Business Workflows. In: Proceedings 9. Fachtagung "Datenbanksysteme in Büro, Technik und Wissenschaft" (BTW'01), Oldenburg, Germany, March 2001.

T. Grabs, K. Böhm, H.-J. Schek: PowerDBIR: Information Retrieval on Top of a Database Cluster. In: Proceedings of ACM CIKM 2001 -- Tenth International Conference on Information and Knowledge Management, Atlanta, GA, USA, November 2001.

H. Schuldt: Process Locking: A Protocol based on Ordered Shared Locks for the Execution of Transactional Processes. In: Proceedings of the ACM Symposium on Principles of Database Systems (PODS'01), Santa Barbara, California, USA, May 2001.

K. Böhm, M. Mlivoncic, R. Weber: Quality-Aware and Load-Sensitive Planning of Image Similarity Queries. In: Proc. of the 17th Int. Conf. on Data Engineering (ICDE 2001), Heidelberg, Germany, April 2001.

T. Grabs, K. Böhm, H.-J. Schek: Scalable Distributed Query and Update Service Implementations for XML Document Elements. To appear in: Proceedings of the Eleventh International Workshop on Research Issues in Data Engineering: Document Management for Data Intensive Business and Scientific Applications , Heidelberg, Germany, April 1-2 2001.

C. Türker, M. Gertz: Semantic Integrity Support in SQL:1999 and Commercial (Object-)Relational Database Management Systems. In: To appear in: The VLDB Journal, 2001.

C. Schuler, H. Schuldt, H.-J. Schek: Supporting Reliable Transactional Business Processes by Publish/Subscribe Techniques. In: Proceedings of the TES'01 Workshop on Technologies for E-Services, Roma, Italy, September 2001.

K. Haller and H. Schuldt: Using Predicates for Specifying Targets of Migration and Messages in a Peer-to-Peer Mobile Agent Environment. In: Proceedings of the 5th IEEE International Conference on Mobile Agents (MA'2001), Atlanta, GA, USA, December 2001.

A. Lazcano, H. Schuldt, G. Alonso, H.-J. Schek: WISE: Process based E-Commerce. In: Bulletin of the IEEE Computer Society Technical Committee on Data Engineering. Special Issue on Infrastructure for Advanced E-Services, March 2001.

T. Grabs, K. Böhm, H.-J. Schek: A Parallel Document Engine Built on Top of a Cluster of Databases - Design, Implementation, and Experiences. April 2000.

H. Schuldt, A. Popovici, H.-J. Schek: Automatic Generation of Reliable E-Commerce Payment Processes. Proc. of the 1st Int. Conf. on Web Information Systems Engineering (WISE'00), Hong Kong, China, June 2000.

K. Böhm, T. Grabs, U. Röhm, H.-J. Schek: Evaluating the Coordination Overhead of Synchronous Replica Maintenance in a Cluster of Databases. In: A. Bode, T. Ludwig, W. Karl, R. Wismüller (Eds.), Euro-Par 2000 Parallel Processing, Proceedings of the 6th International Euro-Par Conference, pages 435-444, Munich, Germany, August 29 - September 01, 2000.

C. Türker, G. Saake: Extensional Assertions and Integrity Constraints in Federated Schemata. In: Information Systems, Vol. 25, No. 8, pp. 503-526, December 2000.

A. Popovici, H. Schuldt, H.-J. Schek: Generation and Verification of Heterogeneous Purchase Processes. In: Proceedings of the International Workshop on Technologies for E-Services (TES'00), Cairo, Egypt, September 2000.

C. Türker, K. Schwarz, G. Saake: Global Transaction Termination Rules in Composite Database Systems. In: B. Lings, K. Jeffery (eds.), Advances in Databases, 17th British National Conf. on Databases, BNCOD 17, Exeter, UK, July 2000, pp. 122-139, LNCS 1832, Springer-Verlag, 2000.

H.-J. Schek, R. Weber: Higher Order Databases and Multimedia Information. In: Proc. of the Swiss/Japan Seminar Advances in Database and Multimedia, Kyoto, Japan, February 2000.

H.-J. Schek, K. Böhm, T. Grabs, U. Röhm, H. Schuldt, R. Weber: Hyperdatabases. In: Proc. of the 1st Int. Conf. on Web Information Systems Engineering (WISE'00), Hong Kong, China, June 2000.

U. Röhm, K. Böhm, H.-J. Schek: OLAP Query Routing and Physical Design in a Database Cluster. In: C. Zaniolo, P.C. Lockemann, M.H. Scholl, T. Grust (Eds.), Advances in Database Technology, Proceedings of the 7th International Conference on Extending Database Technology, EDBT 2000, pages 254-268, Konstanz, Germany, March 27-31, 2000.

K. Böhm: On Extending the XML Engine with Query-Processing Capabilities. In: Proc. of IEEE Advances in Digital Libraries, Bethesda, Maryland, May 2000.

C. Türker: Schema Evolution in SQL-99 and Commercial (Object-) Relational DBMS. In: Database Schema Evolution and Meta-Modeling, 9th Int. Workshop on Foundations of Models and Languages for Data and Objects, Dagstuhl Castle Germany, September 2000.

A. Lazcano, G. Alonso, H. Schuldt, C. Schuler: The WISE Approach to Electronic Commerce. In: International Journal of Computer Systems Science & Engineering. Special Issue on Flexible Workflow Technology Driving the Networked Economy, September 2000.

R. Weber, K. Böhm: Trading Quality for Time with Nearest-Neighbor Search. In: Proc. of the 7th Conf. on Extending Database Technology (EDBT 2000), Konstanz, Germany, March 2000.

C. Schuler, H. Schuldt, H.-J. Schek : Transactional Execution Guarantees for Data-Intensive Processes in Medical Information Systems . Proc. of the 1st European Workshop on Computer-based Support for Clinical Guidelines and Protocols , Leipzig, Germany , November 2000 .

R. Weber, H.-J. Schek: A Distributed Image-Database Architecture for Efficient Insertion and Retrieval Tasks. In Fifth International Workshop on Multimedia Information Systems (MIS'99), Indian Wells, Palm Springs Desert, California, USA, October 1999.

T. Grabs, K. Böhm, H.-J. Schek: A Document Engine on a DB Cluster. In: High Performance Transaction Processing Systems Workshop 1999, Asilomar, California, USA, September 1999.

A. Kuckelberg, L. Relly, H.-J. Schek: A Framework of a Generic Index for Spatio-Temporal Data in Concert. In Workshop on Spatio-Temporal Database Management (STDBM 99), Edinburgh, Scotland, September 1999.

A. Feßler, H.-J. Schek: A Generalized Transaction Theory for Database and Non-Database Tasks. Europar 99, Toulouse (F), August 1999.

R. Weber, H.-J. Schek, J. Bollinger, T. Gross: Architecture of a Networked Image Search and Retrieval System. In Eighth International Conference on Information and Knowledge Management, Kansas City, Missouri, USA, November 1999.

S. Nebiker, L. Relly: Concepts and System Architectures for the Management of Very Large Spatial Raster Objects in a Database Framework. GIS Geo-Informations-Systeme. 4/99 (Vol. 12), August 1999.

H. Schuldt, G. Alonso, H.-J. Schek: Concurrency Control and Recovery in Transactional Process Management. In: Proceedings of the ACM Symposium on Principles of Database Systems (PODS'99), Philadelphia, Pennsylvania, USA, May 31 - June 2 1999.

G. Alonso, A. Fessler, G. Pardon, H.-J. Schek: Correctness in General Configurations of Transactional Components. In: Proceedings of the ACM Symposium on Principles of Database Systems (PODS'99), Philadelphia, Pennsylvania, USA, May 31 - June 2 1999.

H. Schuldt, A. Popovici, H.-J. Schek: Give me all I pay for - Execution Guarantees in Electronic Commerce Payment Processes. In: Proceedings of the Informatik'99 Workshop "Unternehmensweite und unternehmensübergreifende Workflows: Konzepte, Systeme, Anwendungen", Paderborn, Germany, October 1999.

H.-J. Schek: Higher Order Databases - Database Technology Everywhere. Presentation at Swiss Computer Science Conference, EPFL Lausanne, CH, October 1999.

R. Weber, P. Zezula: Is similarity search useful for high dimensional spaces?. In International Workshop on Similarity Search (IWOSS'99), Florence, Italy, September 1999.

L. Relly, U. Röhm: Plug and Play: Interoperability in Concert. In: A. Vckovski et al. (Eds.), Interoperating Geographic Information Systems, Proceedings of the 2nd International Conference, INTEROP'99, pages 277-291, Zurich, Switzerland, March 10-12, 1999.

H. Schuldt, H.-J. Schek, G. Alonso: Transactional Coordination Agents for Composite Systems. In: Proceedings of the International Database Engineering and Applications Symposium (IDEAS'99), Montreal, Canada, August 1999.

G. Alonso, A. Feßler, G. Pardon, H.-J. Schek: Transactions in Stack, Fork, and Join Composite Systems. In: Proceedings of the Int. Conf. on Database Theory, ICDT`99, Jerusalem, January 1999.

G. Alonso, U. Fiedler, C. Hagen, A. Lazcano, H. Schuldt, N. Weiler: WISE: Business to Business E-Commerce. In: Proceedings of the 9th International Workshop on Research Issues in Data Engineering: Information Technology for Virtual Enterprises (RIDE-VE'99), Sydney, Australia, March 1999.

C. Schuler, H. Schuldt, G. Alonso, H.-J. Schek: Workflows over Workflows: Practical Experiences with the Integration of SAP R/3 Business Workflows in WISE. In: Proceedings of the Informatik'99 Workshop "Unternehmensweite und unternehmensübergreifende Workflows: Konzepte, Systeme, Anwendungen", Paderborn, Germany, October 1999.

U. Röhm, K. Böhm: Working Together in Harmony - An Implementation of the CORBA Object Query Service and its Evaluation. In: M. Kitsuregawa et al. (Eds.), Data Engineering, Proceedings of the 15th International Conference, ICDE99, pages 238-247, Sydney, Australia, March 23-26, 1999.

R. Weber, H.-J. Schek, S. Blott: A Quantitative Analysis and Performance Study for Similarity-Search Methods in High-Dimensional Spaces. In: 24th Int. Conf. on Very Large Databases (VLDB), New York, August 1998.

H. Schuldt, H.-J. Schek, M. Tresch: Coordination in CIM: Bringing Database Functionality to Application Systems. In: Proc. of the 5th European Concurrent Engineering Conference (ECEC'98), Erlangen, Germany, April 1998.

L. Relly, H. Schuldt, H.-J. Schek: Exporting Database Functionality - The Concert Way. In: IEEE Data Engineering Bulletin, special issue on Interoperability, 1998.

A. Feßler: Konfliktkonsistente Serialisierbarkeit für hohe Parallelität. In: 10. Workshop "Grundlagen von Datenbanken", Konstanz, Germany, June 1998.

R. Weber: Similarity Search in High-Dimensional Data Spaces. In: 10. Workshop "Grundlagen von Datenbanken", Konstanz, Germany, June 1998.

H. Schuldt, H.-J. Schek: Transaktionelle Koordination von Subsystemen: Sphären zur Entkopplung von Transaktionseigenschaften. In: Proc. of the 9th Workshop "Transaktionen und ihre Anwendung", Warnemünde, Germany, January 1998.

R. Vingralek, H. Hasse, Y. Breitbart, H.-J. Schek: Unifying Concurrency Control And Recovery of Transactions With Semantically Rich Operations. In: Journal of Theoretical Computer Science 190 (1998) p. 363-396, 1998.

S. Blott, R. Weber: A Simple Vector Approximation File for Similarity Search in High-Dimensional Vector Spaces. In: Technical report, Esprit Project Hermes (no. 9141), March 1997.

C. Hagen: Atomaritaet in Workflow- und Prozessunterstuetzungssystemen. In: 9. Workshop "Grundlagen von Datenbanken", Koenigslutter,Germany, May 1997.

D. Ma, G. Alonso: Client-Caching Algorithms in a Video-on-Demand System. In: Technical report, Esprit Project Hermes (no. 9141), April 1997.

G. Alonso, S. Blott, A. Fessler, H.-J. Schek: Correctness and Parallelism in Composite Systems. In: Proc. of the 16th Symp. on Principles of Database Systems (PODS'97), Tucson, Arizona, May 1997.

M. Tresch, M. Rys: Data Warehousing Architektur für Online Analytical Processing. In: Theorie und Praxis der Wirtschaftsinformatik, Heft Nr. 195(34), Heidelberg, Germany, May 1997.

B. Kemme: Datenbankreplikation unter Verwendung von Gruppenkommunikation. 9. Workshop "Grundlagen von Datenbanken", Koenigslutter,Germany, May 1997.

D. Ma, G. Alonso: Distributed Client Caching for Multimedia Data. In: Proc. of the 3rd Int. Workshop on MIS, Como, Italy, September 1997.

G. Alonso, B. Reinwald, C. Mohan: Distributed Data Management in Workflow Environments. In: 7th Int. Workshop on Research Issues in Data Engineering (RIDE'97) , Birmingham, England, April 1997.

G. Alonso, C. Hagen, H.-J. Schek, M. Tresch: Distributed Processing over Stand-alone Systems and Applications. In: Proceedings of VLDB'97, Athens, Greece, August 1997.

D. Agrawal, G. Alonso, A. El Abbadi, I. Stanoi: Exploiting Atomic Broadcast in Replicated Databases. In: Proceedings of Euro-Par'97, Passau, Germany, August 1997.

H. Schuldt, M. Tresch: Flexible Kopplung von CIM-Systemen mit Hilfe von Datenbank-Agenten. In: 9. Workshop "Grundlagen von Datenbanken", Königslutter, Germany, May 1997.

G. Alonso, C. Hagen : Geo-Opera: Workflow Concepts for Spatial Processes. In: 5th Intl. Symposium on Spatial Databases (SSD '97), Berlin, Germany, June 1997.

G. Alonso: Partial Database Replication and Group Communication Primitives. In: 2nd European Research Seminar on Advances in Distributed Systems (ERSADS'97), Zinal (Valais, Switzerland), March 1997.

L. Relly, H.-J. Schek, O. Henricsson, S. Nebiker: Physical Database Design for Raster Images in Concert. In: 5th International Symposium on Spatial Databases (SSD'97), Berlin, Germany, July 1997.

L. Relly: Physischer Datenbankentwurf für mehrdimensionale Daten in Concert. In: GI-Workshop Multidimensionale Datenbanken editor : Peter Baumann, Ulm, Deutschland, March 1997.

G. Alonso: Processes + Transactions = Distributed Applications. In: Proceedings of High Performance Transaction Processing Systems Workshop 1997. (Also in MiddlewareSpectra, vol.11, no.4), Asilomar, California, USA, September 1997.

G. Nerjes, P. Muth, G. Weikum: Stochastic Performance Guarantees for Mixed Workloads in a Multimedia Information System. In: Proc. of the 7th Int. Workshop on Research Issues in Data Engineering (RIDE'97), Birmingham, England, April 7-8 1997.

G. Nerjes, P. Muth, G. Weikum: Stochastic Service Guarantees for Continuous Data on Multi-Zone Disks. In: Proc. of the 16th Symp. on Principles of Database Systems (PODS'97), Tucson, Arizona, May 12-15 1997.

G. Alonso, C. Mohan: Workflow Management: the Next Generation of Distributed Processing Tools. Advanced Transaction Models and Architures, Sushil Jajodia and Larry Kerschberg (eds.), 1997.

G. Alonso, D. Agrawal, A. El Abbadi, M. Kamath, R. Guenthoer, C. Mohan: Advanced Transaction Models in Workflow Contexts. In: Proceedings of the 12th International Conference on Data Engineering, New Orleans, Louisiana, USA, February 1996.

S. Blott, L. Relly, H.-J. Schek: An Open Abstract-Object Storage System. In: Proceedings of the 1996 ACM SIGMOD Conference on Management of Data, Montreal, Canada, June 1996.

M. Tresch, U. Röhm: Building a Federation of Heterogeneous (Non-Database) Repositories. In: W. Hasselbring (Hrsg.), Proceedings of the 2nd Workshop Föderierte Datenbanken, pages 57-63, Dortmund, Germany, December 12-13, 1996.

G. Alonso, H.-J. Schek: Database Technology in Workflow Environments. In: Informatik, 1996.

K. Kaufmann, H.-J. Schek: Extending TP--Monitors for Intra-Transaction Parallelism. In: Proc. of the 4th Int. Conf. on Parallel and Distributed Information Systems , Miami Beach, Florida , December 1996 .

G. Alonso, D. Agrawal, A. El Abbadi, C. Mohan: Functionality and Limitations of Current Workflow Management Systems. In: IEEE Expert, 1996.

H.-J. Schek: Improving the Role of Future Database Systems. In: ACM Computing Surveys 28A(4), ACM, December 1996.

M. Rys, M. C. Norrie, H.-J. Schek: Intra-Transaction Parallelism in the Mapping of an Object Model to a Relational Multi-Processor System. In: Proc. of the 22nd Internat. Conference VLDB, Mumbai (Bombay), India, September 1996.

C. Hagen: Kombination von aktiven Mechanismen und Transaktionen im TRAMs-Projekt. In: 8. Workshop "Grundlagen von Datenbanken", Friedrichsbrunn, Germany, May 1996.

M. Tresch: Middleware - Schlüsseltechnologie zur Entwicklung verteilter Informationssysteme. In: Informatik-Spektrum, Vol. 19, No. 5, Springer Verlag, Heidelberg, Germany, October 1996.

M. Tresch: Principles of Distributed Object Database Languages. Techn. Report No. 248, Zurich, Switzerland, July 1996.

M. Kamath, G. Alonso, R. Günthör, C. Mohan: Providing High Availability in Very Large Workflow Management Systems. In: Proceedings of the Fifth International Conference on Extending Database Technology (EDBT'96) , Avignon, France, March 1996.

G. Alonso, H.-J. Schek: Research Issues in Large Workflow Management Systems. In: Proceedings of the NSF Workshop on Workflow and Process Automation in Information Systems, Athens, Georgia, USA, May 1996.

G. Alonso: The Role of Database Technology in Workflow Management. In: Proceedings of the First International Conference on Interoperable and Cooperative Systems, Brussels, Belgium, June 1996.

H. Hasse, H.-J. Schek: Unified Theory for Classical and Advanced Transaction Models. In: Dagstuhl-Seminar "Object-Orientation with Parallelism and Persistance", 1996.

S. Blott, A. Vckovski: Accessing Geographical Metafiles through a Database Storage System. In: Proceedings of the Fourth International Symposium on Large Spatial Databases, Portland, Maine, August 1995.

M. C. Norrie: Distinguishing Typing and Classification in Object Data Models. In: Information Modelling and Knowledge Bases VI, (Chapter 25), pub. IOS, 1995.

L. Relly, S. Blott: Ein Speichersystem fuer abstrakte Objekte. In: Proc. of the 6th German Conf. on Database Systems for Office, Engineering and Scientific Applications, BTW'95, Dresden, March 1995.

M. C. Norrie, M. Wunderli: Flexible Enterprise Integration through Coordination Repositories. In: Proc. of the 11th Int. Conf. on CAD/CAM, Robotics and Factories of the Future (CARS & FOF), Pereira, Colombia, August 1995.

W. Schaad, H.-J. Schek, G. Weikum: Implementation and Performance of Multi-level Transaction Management in Multidatabase Environment. In: Proc. of the 5th Int. Workshop on Research Issues on Data Engineering: Distributed Object Management, RIDE-DOM'95, Taipei, Taiwan, March 1995.

M. Wunderli, M. C. Norrie, W. Schaad: Multidatabase Agents for CIM Systems. In: Proc. of the 3rd Int. Conf. on Computer Integrated Manufacturing (ICCIM'95), Singapore, July 1995.

H. Kaufmann, M. C. Norrie: Relaxation of Correctness in Database Systems. In: Advances in Databases and Information Systems (ADBIS) Proc. of the 2nd International Workshop of the Moscow ACM SIGMOD Chapter (in cooperation with the Russian Foundation for Basic Research), Moscow, Russia, June 1995.

U. Reimer, P. Lippuner, M. Norrie, M. Rys: Terminological Reasoning by Query Evaluation: A Formal Mapping of a Terminological Logic to an Object Data Model. In: Proc. Int. KRUSE Symp. (Knowledge Retrieval, Use and Storage for Efficiency), Santa Cruz, California, August 1995.

H. Kaufmann, H.-J. Schek: Text Search Using Database Systems Revisited --- Some Experiments. In: Proc. of the 13th British National Conference on Databases, Manchester, United Kingdom, July 1995.

A. Deacon: Transactional Workflows Support using Middleware. In: GISI 95, Z\174rich, Switzerland, September 1995.

M. C. Norrie, D. Kerr: Universal Contextual Queries in Database Networks. In: Proc. of the 3rd Int. Conf. on Cooperative Information Systems, Vienna, Austria, May 1995.

L. Relly, A. Wolf: A Storage Manager for the Development of Spatial Data Structures. In: Int. Workshop on Advanced Research in Geographic Information Systems, March 1994.

G. Alonso, R. Vingralek, D. Agrawal, Y. Breitbart, A. El Abbadi, H.-J. Schek, G. Weikum: A Unified Approach to Concurrency Control and Transaction Recovery (Extended Abstract). In: Proc. of the 4th Int. Conf. on Extending Database Technology (EDBT), Cambridge, UK, March 1994.

B. Blott, H. Kaufmann, L. Relly, H.-J. Schek: Buffering Long Externally-Defined Objects. In: Proc. of the 6th Int. Workshop on Persistent Object Systems (POS6), Tarascon, France, September 1994.

M. C. Norrie, W. Schaad, H.-J. Schek, M. Wunderli: CIM through Database Coordination. In: Proc. of the Int. Conf. on Data and Knowledge Systems for Manufacturing and Engineering, Hongkong, May 1994.

A. Wolf, M. De Lorenzi, T. Ohler, V. H. Nguyen: COSIMA, A Network Based Architecture for GIS. In: GIS'94: Geographic Information Systems. J. Nievergelt, T. Roos, H.-J. Schek, P. Widmayer (Eds.): Int. Workshop on Advanced Research in Geographic Information Systems, Monte Verità, Ascona, Switzerland, Februar/March 1994.

M. C. Norrie, M. Wunderli, R. Montau, U. Leonhardt, W. Schaad, H.-J. Schek: Coordination Approaches for CIM. In: Proc. of the European Workshop on Integrated Manufacturing Systems Engineering, Grenoble, December 1994.

M. C. Norrie, M. Wunderli: Coordination System Modelling. In: Proc. of the 13th Int. Conf. on the Enitity Relationship Approach, Manchester, UK, December 1994.

P. Scheuermann, G. Weikum, P. Zabback: Data Partitioning and Load Balancing in Parallel Disk Systems. Techn. Report No. 209, Zurich, Switzerland, January 1994.

M. C. Norrie, W. Schaad, H.-J. Schek, M. Wunderli: Exploiting Multidatabase Technology for CIM. July 1994.

M. C. Norrie, U. Reimer, P. Lippuner, M. Rys, H.-J. Schek: Frames, Objects and Relations: Three Semantic Levels for Knowledge Base Systems. In: Workshop on "Reasoning about Structured Objects: Knowledge Representation meets Databases" (KRDB-94), Saarbrücken, Germany, September 1994.

U. Reimer, P. Lippuner, R. Marti, M. C. Norrie, H.-J. Schek, U. Badertscher, M. Rys: HYWIBAS: A Hybrid Knowledge Base System for Large, Shared Knowledge Bases. In: SPP Informatik, Module 2 Workshop "Knowledge based Systems", Yverdon, December 1994.

M. Rys, G. Weikum: Heuristic Optimization of Speedup and Benefit/Cost for Parallel Database Scans on Shared-Memory Multiprocessors. In: Proc. of the 8th Int. Parallel Processing Symposium IPPS, Cancun, Mexico, April 1994.

G. Dröge: Patchwork - A Query-driven Locally Adaptive Data Space Partitioning. In: GIS'94: Geographic Information Systems. J. Nievergelt, T. Roos, H.-J. Schek, P. Widmayer (Eds.): Int. Workshop on Advanced Research in Geographic Information Systems, Monte Verità, Ascona, Switzerland, Februar/March 1994.

A. Deacon, H.-J. Schek, G. Weikum: Semantics-based Multilevel Transaction Management in Federated Systems. In: Proc. of the 10th Int. Conf. on Data Engineering (ICDE'94), Houston, Texas, February 1994.

M. H. Scholl, C. Laasch, C. Rich, H.-J. Schek, M. Tresch: The COCOON Object Model. Techn. Report No. 211, Zurich, Switzerland, Februar 1994.

R. Vingralek, H. Ye, Y. Breitbart, H.-J. Schek: Unified Transaction Model for Semantically Rich Operations. July 1994.

G. Alonso, R. Vingralek, D. Agrawal, Y. Breitbart, A. El Abbadi, H.-J. Schek, G. Weikum: Unifying Concurrency Control and Recovery of Transactions. In: Information Systems, Vol. 19, No. 1, pp. 101-115, 1994.

M. De Lorenzi, A. Wolf: A Protocol for Cooperative Spatial Information Managers. In: Proc. of the DBTA Workshop on Interoperability of Database Systems and Database Applications, Fribourg, Switzerland, October 1993.

P. Scheuermann, G. Weikum, P. Zabback: Adaptive Load Balancing in Disk Arrays. In: Proc. of the 4th Int. Conf. on Foundations of Data Organization and Algorithms (FODO'93), Chicago, October 1993.

M. C. Norrie: An Extended Entity-Relationship Approach to Data Management in Object-Oriented Systems. In: Proc. of the 12th Int. Conf. on Entity-Relationship Approach, Dallas, Texas, USA, December 1993.

S. Dessloch, T. Härder, F.-J. Leick, N. M. Mattos, C. Laasch, C. Rich, M.-H. Scholl, H.-J. Schek: COCOON and KRISYS: A Comparison. Techn. Report No. 195,, Zurich, Switzerland, March 1993.

R. Vingralek, Y. Breitbart, H.-J. Schek, G. Weikum: Concurrency Control Protocols Guaranteeing Atomicity and Serializability. Techn. Report No. 199, Zurich, Switzerland, July 1993.

P. Zabback, G. Weikum: Data Partitioning for Optimal I/O Parallelism in Advanced Database Applications. In: 5th German Conf. on Database Systems for Office, Engineering and Scientific Applications, Braunschweig, Germany, March 1993.

U. Reimer, M. Rys, H.-J. Schek, R. Marti: Datenbankbasierung eines Frame-Modells: Abbildung auf ein Objektmodell und effiziente Unterstützung komplexer Operationen . Techn. Report No. 5/93, Zurich, Switzerland, August 1993.

R. Vingralek, Y. Breitbart, G. Weikum, R. Yavatkar: Distributed File Organization with Scalable Cost/Performance. Techn. Report No. 207, Zurich, Switzerland, December 1993.

G. Weikum: Extending Transaction Management To Capture More Consistency With Better Performance. 9th French Database Conf., Toulouse, France, September 1993.

W. Schaad, H.-J. Schek: Federated Transaction Management Using Open Nested Transactions. In: Proc. of the DBTA Workshop on Interoperability of Database Systems and Database Applications, Fribourg, Switzerland, October 1993.

H.-J. Schek, A. Wolf: From Extensible Databases to Interoperability between Multiple Databases and GIS Applications. In: Abel, Oui (Eds.); Advances in Spatial Databases: Proc. of the 3rd Int. Symposium on Large Spatial Databases, Singapore, June 1993.

B. Jiang: I/O- and CPU-Optimal Recognition of Strongly Connected Components. In: Information Processing Letters 45, 1993.

G. Weikum, P. Zabback: I/O-Parallelism and Fault Tolerance in Disk Arrays. In: Informatik- Spektrum, 1993.

C. Hasse, G. Weikum: Inter- and Intra-Transaction Parallelism in Database Systems. In: Proc. of the 14th Workshop "Applications on Massively Parallel Systems", Zurich, Switzerland, September 1993.

Y. Breitbart, A. Deacon, H.-J. Schek, A. Sheth, G. Weikum: Merging Application-centric and Data-centric Approaches to Support Transaction-oriented Multi-system Workflows. In: ACM SIGMOD Record, September 1993.

G. Weikum, C. Hasse: Multi-Level Transaction Management for Complex Objects: Implementation, Performance, Parallelism. In: The VLDB Journal, (2)4, 1993.

M. H. Scholl, H.-J. Schek, M. Tresch: Object Algebra and Views for Multi-Objectbases. In: M.T. Özsu, U. Dayal, P. Valduriez (eds.), "Distributed Object Management", Morgan Kaufmann, 1993.

G. Weikum, A. Deacon, W. Schaad, H.-J. Schek: Open Nested Transactions in Federated Database Systems. In: IEEE Data Engineering Bulletin, Vol. 16, No. 2, June 1993.

G. Dröge, H.-J. Schek: Query-Adaptive Data Space Partitioning using Variable-Size Storage Clusters. In: Proc. of the 6th Int. Workshop on Persistent Object Systems (POS6), Tarascon, France, June 1993.

P. Muth, T. C. Rakow, G. Weikum, P. Brössler, C. Hasse: Semantic Concurrency Control in Object-Oriented Database Systems. In: Proc. of the 9th IEEE Int. Conf. on Data Engineering, Vienna, April 1993.

G. Weikum, C. Hasse, A. Mönkeberg, M. Rys, P. Zabback: The COMFORT Project, Project Synopsis (Work in Progress). In: Proc. of the 2nd Int. Conf. on Parallel and Distributed Information Systems, San Diego, January 1993.

M. Andersson, Y. Dupont, S. Spaccapietra, K. Yétongnon, M. Tresch, H. Ye: The FEMUS Approach in Building a Federated Multilingual Database System. In: Proc. of the 3rd Int. Workshop on Research Issues on Data Engineering: "Interoperability in Multidatabase Systems" (RIDE-IMS'93), Vienna, March 1993.

E. J. O'Neil, P. E. O'Neil, G. Weikum: The LRU-K Page Replacement Algorithm For Database Disk Buffering. In: Proc. of the ACM SIGMOD Int. Conf. on Management of Data, Washington, DC, May 1993.

H.-J. Schek, G. Weikum, H. Ye: Towards a Unified Theory of Concurrency Control and Recovery. In: 12th ACM SIGACT-SIGMOD-SIGART Symposium on Principles of Database Systems (PODS), Washington, DC, May 1993.

R. H. Güting: A Tool for Specifying Data Models, Query Processing, and Optimization. Techn. Report No. 192, Dept. of Computer Science, ETH Zurich, December 1992.

W. B. Teeuw, C. Rich, M. H. Scholl, H. M. Blanken: An Evaluation of Physical Disk I/Os for Complex Object Processing. Techn. Report No. 183, Dept. of Computer Science, ETH Zurich, September 1992.

P. Scheuermann, G. Weikum, P. Zabback: Automatic Tuning of Data Placement and Load Balancing in Disk Arrays. In: Database Systems for Next-Generation Applications Ð Principles and Practice, Advanced Database Research and Development Series (edited by W. Kim and Y. Kambayashi), World Scientific Publications, 1992.

G. Weikum, H.-J. Schek: Concepts and Applications of Multilevel Transactions and Open Nested Transactions. In: A.K. Elmagarmid (Ed.), Database Transaction Models for Advanced Applications chapter : 13, Morgan Kaufmann, San Mateo, CA, 1992.

H.-J. Schek, A. Wolf: Cooperation between Autonomous Operation Services and Object Database Systems in a Heterogeneous Environment. In: Proc. of the IFIP TC2/WG2.6 Conf. on Semantics of Interoperable Database Systems, DS-5, Lorne, Victoria, Australia publisher : D. K. Hsiao, E. J. Neuhold, R. Sacks-Davis, Elsevier (North-Holland), November 1992.

M. H. Scholl: Extensions to the Relational Data Model. In: Advances in Conceptual Modelling, Databases, and CASE: An Integrated View, P. Loucopoulos and R. Zicari (eds.), John Wiley, New York, 1992.

C. Laasch, M. H. Scholl: Generic Update Operations Keeping Object-Oriented Databases Consistent. In: Proc. of the 2nd GI-Workshop on Information Systems and AI (IS/KI), Ulm, February 1992.

B. Jiang: I/O-Efficiency of Shortest Path Algorithms: An Analysis. In: Proc. of IEEE Data Engineerin, Phoenix, February 1992.

M. Tresch, M. H. Scholl: Meta Object Management and its Application to Database Evolution. In: Proc. of the 11th Int. Conf. on the Entity-Relationship Approach, Karlsruhe, Germany, September 1992.

A. Mönkeberg, G. Weikum: Performance Evaluation of an Adaptive and Robust Load Control Method for the Avoidance of Data-Contention Thrashing. In: Proc. of the 18th Int. Conf. on Very Large Data Bases, Vancouver, August 1992.

W. Waterfeld, H.-J. Schek: The DASDBS Geokernel - an Extensible Database System for GIS. In: A. K. Turner (ed.), Kluwer Academic Publishers, 1992.

G. Weikum, P. Zabback: Tuning of Striping Units in Disk-Array-Based File SystemS. In: Proc. of the 2nd Int. Workshop on Research Issues on Data Engineering: Transaction and Query Processing (RIDE-TQP), February 1992.

M. Tresch: A Framework for Schema Evolution by Meta Object Manipulation. In: Proc. of the 3rd Int. Workshop on Foundations of Models and Languages for Data and Objects, Aigen, Austria, September 1991.

H.-J. Schek, G. Weikum, W. Schaad: A Multi-Level Transaction Approach to Federated DBMS Transaction Management. In: Proc. of the First Int. Workshop on Inter- operability in Multidatabase Systems, (IMS'91), Kyoto, April 1991.

C. Hasse, G. Weikum: A Performance Evaluation of Multi-Level Transaction Management. In: Proc. of the 17th Int. Conf. on Very Large Data Bases (VLDB), Barcelona, September 1991.

A. Mönkeberg, G. Weikum: Conflict-driven Load Control for the Avoidance of Data-Contention Thrashing. In: Proc. of the 7th Int. Conf. on Data Engineering, Kobe, Japan, April 1991.

B. Jiang: DFS-Traversing Graphs in a Paging Environment LRU or MRU?. In: Information Processing Letters, Vol. 40, No. 4, North-Holland, November 1991.

G. Weikum, P. Zabback, P. Scheuermann: Dynamic File Allocation in Disk Arrays. In: Proc. of the ACM SIGMOD Conf., Denver, May 1991.

H.-J. Schek, G. Weikum: Erweiterbarkeit, Kooperation, Föderation von Datenbanksystemen. In: Proc. of the 4th GI Conf. on Database Systems for Office, Engineering, and Scientific Applications (BTW), Kaiserslautern, March 1991.

H.-J. Schek, P. Scheuermann, A. Wolf: From Extensibility to Interoperability between Database Systems and Application Systems. In: Proc. of the First Int. Workshop on Interoperability in Multidatabase Systems (IMS'91), Kyoto, April 1991.

H.-J. Schek, M. H. Scholl: From Relations and Nested Relations to Object Models. In: Proc. of the 9th British National Conf. on Databases, Wolverhampton, UK, July 1991.

M. Tresch, M. H. Scholl: Implementing an Object Model on Top of Commercial Database Systems. In: Proc. of the 3rd GI Workshop on Foundation of Database Systems, Volkse, Germany, May 1991.

A. Mönkeberg, G. Weikum: Konflikt-gesteuerte Lastkontrolle in Datenbanksystemen basierend auf der Analyse von Transaktionsprogrammen. In: Proc. 6. GI/ITG-Fachtagung über Messung, Modellierung und Bewertung von Rechensystemen (MMB'91), Neubiberg, September 1991.

U. Deppisch, H.-B. Paul, H.-J. Schek, G. Weikum: Managing Complex Objects in the Darmstadt Database Kernel System. In: K.R. Dittrich, U. Dayal, A.P. Buchmann (Eds.), On Object-Oriented Database Systems, Topics in Information Systems, Springer-Verlag, 1991.

G. Weikum, H.-J. Schek: Multi-Level Transactions and Open Nested Transactions. In: IEEE Data Engineering Bulletin, Vol. 14, No. 1, March 1991.

G. Weikum: Principles and Realization Strategies of Multi-Level Transaction Management. In: ACM Transactions on Database System, Vol. 16, No. 1, March 1991.

A. Heuer, M. H. Scholl: Principles of Object-Oriented Query Languages. In: Proc. of the 4th GI Conf. on Database Systemsfor Office, Engineering, and Scientific Applications (BTW) , Kaiserslautern, March 1991.

M. H. Scholl, H.-J. Schek: Supporting Views in Object-Oriented Databases. In: IEEE Data Engineering Bulletin, Vol. 14, No. 2, pp. 43-47, June 1991.

H.-J. Schek, M. H. Scholl, G. Weikum: The Background of the DASDBS & COSMOS Projects. In: Proc. of the 3rd MFDBS, Rostock, May 1991.

B. Jiang: Traversing Graphs in a Paging Environment, BFS or DFS?. In: Information Processing Letters, Vol. 37, No. 3, North-Holland, February 1991.

M. H. Scholl, C. Laasch, M. Tresch: Updatable Views in Object-Oriented Databases. In: Proc. of the 2nd DOOD Conf., Munich, December 1991.

H.-J. Schek, A. Wolf: Weiterführende Datenbankkonzepte für räumliche Datenräume. In: Seminar on Photogrammetry and Geographic Information Systems, Zurich, April 1991.

M. H. Scholl, H.-J. Schek: A Relational Object Model. In: ICDT'90 - Proc. of the 3rd Int. Conf. on Database Theory, Paris, December 1990.

B. Jiang: A Suitable Algorithm for Computing PartialTransitive Closures in Databases . In: Proc. of the 6th Int. Conf. on Data Engineering, pp. 264-271, Los Angeles, 1990.

M. H. Scholl, H.-J. Schek: A Synthesis of Complex Objects and Object-Orientation. In: Proc. of the IFIP TC2 Working Conf. "Object-Oriented Databases: Analysis, Design & Construction" (DS-4), R.A. Meersman, W. Kent, S. Khosla (eds.), Windermere, U.K., July 1990.

B. Jiang: Design, Analysis, and Evaluation of Algorithms for Computing Partial Transitive Closures in Databases. Techn. Report No. 132, Dept. of Computer Science, ETH Zurich, June 1990.

G. Dröge, H.-J. Schek, A. Wolf: Erweiterbarkeit in DASDBS. In: Informatik Forschung und Entwicklung, (1990) 5, Special, Issue on Non-Standard Database Systems (in German), pp. 162-176, 1990.

H.-J. Schek, M. H. Scholl: Evolution of Data Models. In: A. Blaser (Ed.) Database Systems of the 90's, November 1990.

M. H. Scholl, H.-J. Schek: Evolution von Datenmodellen. In: HMD-Theorie und Praxis der Wirtschaftsinformatik, Issue No. 152, Forkel-Verlag, Wiesbaden, March 1990.

H.-J. Schek, M. H. Scholl, G. Weikum: From the KERNEL to the COSMOS: The Database Research Group at ETH Zurich. Techn. Report No. 136, Dept. of Computer Science, ETH Zurich, July 1990.

A. Wolf: How to fit GEO-Objects into Databases - an Extensibility Approach. In: Proc. of the 1st European Conf. on GIS, Vol. 2, pp. 1164-1172, Amsterdam, April 1990.

G. Weikum, C. Hasse, P. Brössler, P. Muth: Multi-Level Recovery. In: Proc. of the 9th ACM Symposium on Principles of Database Systems, pp. 109-123, Nashville, April 1990.

P. Zabback, H.-B. Paul, U. Deppisch: Office Documents on a Database Kernel -Filing, Retrieval, and Archiving. In: Proc. of the 5th Conf. on Office Information Systems (COIS), pp. 261-270, Cambridge, MA, April 1990.

P. Zabback: Optical and Magneto-Optical Disks in File- and Database Systems. In: Informatik-Spektrum, (1990) 13, 1990.

G. Weikum, C. Hasse, A. Mönkeberg, P. Zabback: The COMFORT Project: A Comfortable Way to Better Performance. Techn. Report No. 137, Dept. of Computer Science, ETH Zurich, July 1990.

H.-J. Schek, H.-B. Paul, M. H. Scholl, G. Weikum: The DASDBS Project: Objectives, Experiences, and Future Prospects . In: IEEE Transactions on Knowledge and Data Engineering Vol. 2, No. 1, Special Issue on Prototype Systems, pp. 25-4, March 1990.