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Publications


Conference Publications

  • C. Forster, G. Vossen: Exploiting XML Technologies in Medical Information Systems (25th Bled eConference eDependability: Reliable and Trustworthy eStructures, eProcesses, eOperations and eServices for the Future), 2012
  • J.-N. Mazón, J. Lechtenbörger, J. Trujillo: A model-driven approach for enforcing summarizability in multidimensional modeling (1st International Workshop on Modeling and Reasoning for Business Intelligence (MoRE-BI, ER 2011 Workshop), LNCS 6999), 2011
  • T. Haselmann and G. Vossen: Software-as-a-Service in Small and Medium Enterprises: An Empirical Attitude Assessment (Proc. 12th International Conference on Web Information Systems Engineering (WISE) 2011, Springer), 2011 (Abstract) (Download)
  • P. Dziuballe, C. Forster, B. Breil, V. Thiemann, F. Fritz, J. Lechtenbörger, G. Vossen, M. Dugas: The Single Source Architecture x4T to Connect Medical Documentation and Clinical Research (Proceedings of MIE 2011), 2011 (Abstract)
  • T. Haselmann, G. Vossen, S. Lipsky, T. Theurl: Cooperative Community Clouds for Small and Medium Enterprises (Proc. 1st Int'l. Conf. on Cloud Computing and Service Science (CLOSER 2011)), 2011 (Abstract)
  • T. Haselmann, A. Winkelmann, G. Vossen: Towards a Conceptual Model for Trustworthy Skills Profiles in Online Social Networks (Information Systems Development, Springer New York), 2011 (Abstract) (Download)
  • T. Haselmann, G. Thies, G. Vossen: Looking into a REST-based API for Database-as-a-Service Systems (12th IEEE Conference on Commerce and Enterprise Computing (CEC 2010), Shanghai, China, Nov. 10-12), 2010 (Abstract) (Download)
  • A. Winkelmann, T. Haselmann: Ein konzeptionelles Model auf Basis von Markov-Ketten zur Berechnung und Bewertung von per­sönlichen Kompe­ten­zen in sozialen Netzwerken (Multikonferenz Wirtschaftsinformatik (MKWI), S. 1317–1328), 2010 (Abstract) (Download)
  • G. Thies, G. Vossen: Governance in Web-Oriented Architectures (2009 IEEE Asia-Pacific Services Computing Conference (IEEE APSCC 2009), Biopolis, Singapore, Dec. 7 - 11, 180 - 186), 2009 (Abstract)
  • M. Dugas, B. Breil, V. Thiemann, J. Lechtenbörger, G. Vossen: Single Source Informationssysteme - Nutzung von Routinedaten für die klinische Forschung (Proc. 54. Jahrestagung der Deutschen Gesellschaft für Medizinische Informatik, Biometrie und Epidemiologie e.V. (GMDS)), 2009
  • M. Dugas, B. Breil, V. Thiemann, J. Lechtenbörger, G. Vossen: Single Source Information Systems to Connect Patient Care and Clinical Research (Proc. 22nd International Conference of the European Federation for Medical Informatics: Medical Informatics in a United and Healthy Europe (MIE), 61-65), 2009 (Abstract)
  • S. Hagemann, G. Vossen: ActiveTags: Making tags more useful anywhere on the Web (20th Australasian Database Conference, Wellington, New Zealand, 41-48), 2009 (Abstract)
  • G. Thies, G. Vossen: Modelling Web-Oriented Architectures (Proc. 6th Asia-Pacific Conference on Conceptual Modelling (APCCM) 2009, Wellington, New Zealand; Conferences in Research and Practice in Information Technology, Volume 96, Australian Computer Science Communications, Volume 31, Number 6, 97 - 105), 2009 (Abstract)
  • G. Thies, G. Vossen: Web-orientierte Architekturen: Auswirkungen des Web 2.0 auf Service-orientierte Architekturen (EMISA Fachgruppentreffen 2008, St. Augustin, 18.-19. September, 77-89), 2008 (Abstract)
  • A. Winkelmann, G. Vossen, J. Becker, T. Haselmann, S. Herwig, J. Pöppelbuß: Bewertungsmechanismen zur beruflichen Weiterqualifizierung in sozialen Web 2.0-Netzwerken (Proc. 38. GI Jahrestagung (2), S. 955-961), 2008 (Abstract)
  • M. Juhrisch, G. Thies: Service Management Beyond UDDI - A Design Science Approach (Proceedings of the 12th Pacific Asia Conference on Information Systems (PACIS 2008), Suzhou, China, pp. 1480-1488), 2008
  • G. Thies, G. Vossen: Web-oriented Architectures: On the Impact of Web 2.0 on Service-oriented Architectures (2008 IEEE Asia-Pacific Services Computing Conference, December 9-12, 2008, Yilan, Taiwan, 1075-1082), 2008 (Abstract)
  • J.-N. Mazón, J. Lechtenbörger, J. Trujillo: Solving Summarizability Problems in Fact-Dimension Relationships for Multidimensional Models (Proc. 11th ACM International Workshop on Data Warehousing and OLAP (DOLAP)), 2008 (Abstract)
  • J. Schwieren, G. Vossen: ID-Services: An RFID Middleware Architecture for Mobile Applications (The 2nd International Workshop on RFID Technology - Concepts, Applications, Challenges (IWRT 2008) in conjunction with the ICEIS 2008), 2008 (Abstract)
  • D. Dahl, J. Lechtenbörger, J. Sieberg, G. Vossen: Process Learning in a Web 2-0-Inspired Learning Environment (Proceedings e-Learning Baltics (eLBa), Rostock), 2008 (Abstract)
  • D. Dahl, J. Sieberg, G. Vossen: Der Weg ist das Ziel: Abiturvorbereitung durch individuelles und gemeinschaftliches Lernen im Web (Interesse wecken und Grundkenntnisse vermitteln - 2. Münsteraner Workshop zur Schulinformatik, ZfL-Verlag Münster), 2008 (Abstract)
  • M. Juhrisch, G. Thies: UDDI war gestern - Universelles Dienstleistungsverzeichnis an einer großen Universität (1. DFN-Forum Kommunikationstechnologien „Verteilte Systeme im Wissenschaftsbereich“, Kaiserslautern), 2008 (Abstract) (Download)
  • D. Dahl, J. Sieberg, J. Lechtenbörger, G. Vossen: Learnr - Web 2.0-Driven Learning (Proc. 7th International Conference on Web-based Education (WBE), Innsbruck), 2008 (Abstract)
  • M.A. Chatti, D. Dahl, M. Jarke, G. Vossen: Towards Web 2.0-Driven Learning Environments (Proc. 4th International Conference on Web Information Systems and Technolgies (WEBIST), Funchal), 2008 (Abstract)
  • E. Deakins, St. Dillon, H. Al Namani, G. Vossen: Collaborating with Citizens: The E-Government Policymakers' View (Proc. 10th Collaborative Electronic Commerce Technology and Research (CollECTeR) Conference 2007, Melbourne, Australia), 2007
  • G. Vossen, P. Westerkamp: Establishing Business Models for Service-Oriented E-Learning (Proc. IADIS International Conference e-Learning, Lissabon, 35-42), 2007
  • S. Hagemann, C. Letz, G. Vossen: Web Service Discovery - Reality Check 2.0 (Proc. of NWeSP'07), 2007
  • J. Schwieren, G. Vossen: Implementing Physical Hyperlinks for Mobile Applications using RFID Tags (IDEAS '07, Banff, Canada September, 2007), 2007 (Abstract)
  • D. Dahl, G. Vossen: Learning Object Metadata Generation in the Web 2.0 Era (Proc. IADIS International Conference e-Learning 2007, Lisbon (Portugal)), 2007 (Abstract)
  • D. Dahl, G. Vossen: Added Value for e-Learning Repositories through Social Tagging of Learning Objects (Workshop Proc. 12th BTW, Aachen), 2007 (Abstract)
  • T. Haselmann, J. Lechtenbörger, G. Vossen: Data Warehouse Detective: Schema Design Made Easy (Proc. 12th BTW, pp. 606-608), 2007 (Abstract) (Download)
  • S. Rizzi, A. Abelló, J. Lechtenbörger, J. Trujillo: Research in Data Warehouse Modeling and Design: Dead or Alive? (Proc. 9th ACM International Workshop on Data Warehousing and OLAP (DOLAP)), 2006 (Abstract)
  • J.-N. Mazón, J. Trujillo, J. Lechtenbörger: A Set of QVT Relations to Assure the Correctness of Data Warehouses by Using Multidimensional Normal Forms (Proc. 25th International Conference on Conceptual Modeling (ER)), 2006 (Abstract)
  • D. Dahl, G. Vossen, P. Westerkamp: share.loc - A Multi Tiered Interoperable E-Learning Metadata Repository (The 6th IEEE International Conference on Advanced Learning Technologies (ICALT 2006), Kerkrade, The Netherlands, 5.-7. July), 2006 (Abstract)
  • G. Vossen, P. Westerkamp: Towards the Next Generation of E-Learning Standards: SCORM for Service-Oriented Environments. (The 6th IEEE International Conference on Advanced Learning Technologies (ICALT 2006), Kerkrade, The Netherlands, 5.-7. July), 2006 (Abstract)
  • G. Vossen, P. Westerkamp: Can Service-Orientation Make E-Learning Standards Obsolete? (Proc. Montreal Conference on eTechnologies 2006 (MCeTECH 2006), Montreal, Canada, May ), 2006 (Abstract)
  • J. Schwieren, G. Vossen, P. Westerkamp: Efficient Handling of Programming Exercises in a Scalable E-Learning Platform (Proc. of 4th European Conference on E-Learning (ECEL2005), Amsterdam, Netherlands, November 2005, pp. 389-396 ), 2005
  • J. Lechtenbörger: Keynote: My Favorite Issues in Data Warehouse Modeling (Abstract) (Proc. 8th ACM International Workshop on Data Warehousing and OLAP (DOLAP), p. 87), 2005
  • B. Hüsemann, G. Vossen: Ontology Engineering from a Database Perspective (Extended Abstract) (ASIAN05), 2005
  • G. Vossen, P. Westerkamp: Provisioning in a Service-Based E-Learning Platform (Proc. of 2nd International Conference on Inovations in Inforamtion Technology (IIT 2005), Dubai, UAE, September), 2005 (Abstract)
  • G. Vossen, G. Thies: ISETTA: Service Orientation in the "Bologna Process" of a Large University (ISD 2005), 2005
  • G. Vossen, P. Westerkamp: Building a Service Platform for Electronic Learning (Proc 2nd ICIT2005, Amman, Jordan, pp. 151 --157), 2005 (Abstract)
  • G. Vossen, P. Westerkamp: Mediators for Integrating Content into Service-based e-Learning Environments (Proc ICALT 2005, pp. 580-584, Kaohsiung, Taiwan, July ), 2005 (Abstract)
  • S. Hagemann, S. Reimers, G. Vossen, P. Westerkamp: BOGSY: A Flexible Information System for Botanical Gardens (Proc. of 8th Spring International Conference on Information Systems Implementation and Modelling (ISIM '05)), 2005 (Abstract)
  • S. Reimers, S. Schilz, C. Sonnenberg: BOGSY – ein Informationssystem für Botanische Gärten (Informatiktage 2005 -- Fachwissenschaftlicher Informatik-Kongress, 8. und 9. April 2005, Schloss Birlinghoven, Sankt Augustin), 2005 (Abstract)
  • G. Vossen, P. Westerkamp: Intelligent Content Discovery within E-Learning Web (B. Trezzini, P. Lambe, S. Hawamdeh (eds.) People, Knowledge, and Technology: What Have We Learnt So Far?, Proc. 1st International Conference on Knowledge Management (ICKM) 2004, Singapore, 365–375), 2004 (Abstract)
  • M. Golfarelli, J. Lechtenbörger, S. Rizzi, G. Vossen: Schema Versioning in Data Warehouses (Proc. 3rd International Workshop on Evolution and Change in Data Management), 2004 (Abstract)
  • G. Vossen, P. Westerkamp: UDDI for E-Learning: A Respository for Distributed Learning Objects (Proc. 2nd IASTED International Conference on), 2003
  • G. Vossen, P. Westerkamp: Distributed Storage and Dynamic Exchange of Learning Objects (Proc. THE 2nd EUROPEAN CONFERENCE ON eLEARNING (ECEL 2003), Glasgow, UK, pp. 469-478, November), 2003
  • V. Pankratius, G. Vossen : Towards E-Learning Grids: Using Grid Computing in Electronic Learning (IEEE Workshop on Knowledge Grid and Grid Intelligence (in conjunction with 2003 IEEE/WIC International Conference on Web Intelligence / Intelligent Agent Technology), pp. 4-15. Saint Mary's University, Halifax, Nova Scotia, Canada, October), 2003 (Abstract)
  • G. Vossen, P. Westerkamp: Zur Nutzung von Web Services im E-Learning (Proc. Symposium Entwicklung Web-Service basierter Anwendungen im Rahmen der 33. GI-Jahrestagung, Frankfurt am Main, Germany, pp. 47-58, October), 2003
  • G. Vossen, P. Westerkamp: A Web Services Approach to E-Learning (Proc. 2nd GI Workshop on e-Learning, Leipzig, Germany, pp. 215-228), 2003
  • G. Vossen, P. Jaeschke: Learning Objects as a Uniform Foundation for E-Learning Platforms (Proc. 7th International Database Engineering and Applications Symposium (IDEAS 2003), 16-18 July 2003, Hong Kong, China, pp. 278-289), 2003 (Abstract)
  • G. Vossen, P. Westerkamp: E-Learning as a Web Service (Extended Abstract) (Proc. 7th International Database Engineering and Application Symposium (IDEAS 2003), Hong Kong S.A.R., China, pp. 242-249, July ), 2003 (Abstract)
  • J. Lechtenbörger: The impact of the constant complement approach towards view updating (Proc. 22nd PODS 2003, pp. 49-55), 2003 (Abstract) (Download)
  • J. Lechtenbörger: Data Warehouse Schema Design (Proc. 10th BTW 2003, pp. 513-522 (dissertation award)), 2003 (Download)
  • C. Letz, E. T. Henn, G. Vossen: Consistency in Data Warehouse Dimensions (Proc. 6th International Database Engineering & Applications Symposium (IDEAS), Edmonton, Canada, 224-232), 2002
  • G. Vossen, P. Jaeschke, A. Oberweis: Flexible Workflow Management as a Central E-Learning Support Paradigm (Proc. 1st European Conf. on E-Learning, Uxbridge, UK, Nov. 2002, pp. 253—267), 2002
  • G. Vossen, P. Jaeschke: Towards a Uniform and Flexible Data Model for Learning Objects (Proc. 30th Annual Conference of the International Business School Computing Association (IBSCA), Savannah, Georgia, July 2002, pp. 99-129.), 2002
  • B. Hüsemann, J. Lechtenbörger, G. Vossen, P. Westerkamp: XLX - A Platform for Graduate-Level Exercises (Proc. ICCE 2002 - International Conference on Computers in Education, Auckland, New Zealand, S. 1262-1266), 2002 (Abstract)
  • J. Lechtenbörger, G. Vossen: On the computation of relational view complements (extended abstract) (Proc. 21th Annual ACM SIGACT-SIGMOD-SIGART Symposium on Principles of Database Systems (PODS) 2002, Madison, WI, 142-149), 2002 (Abstract)
  • C. Letz: Temporale Aspekte im Data Warehousing (BTW Studierenden-Programm, 56-57), 2001
  • U. Masermann, G. Vossen: SISQL: Schema-Independent Database Querying (on and off the Web) (Proc. 4th International Conference on Database Engineering and Applications(IDEAS) 2000, Yokohama, Japan, 55-64), 2000 (Abstract)
  • U. Masermann, G. Vossen: Design and Implementation of a Novel Approach to Keyword Searching in Relational Databases (Proc. 4th East-European Conference on Advances in Databases andInformation Systems (ADBIS) 2000, Prag, Springer LNCS 1884, 171-184), 2000 (Abstract)
  • B. Hüsemann, J. Lechtenbörger, G. Vossen: Conceptual Data Warehouse Design (Proc. 2nd International Workshop on Design and Management of Data Warehouses (DMDW) 2000, Stockholm; Report 25, Swiss Life IT Research and Development Zürich, 6.1-6.11), 2000 (Abstract)
  • J. Lechtenbörger, G. Vossen: On Herbrand Semantics and Conflict Serializability of Read-Write Transactions (Proc. 19th Annual ACM SIGACT-SIGMOD-SIGART Symposium on Principles of Database Systems (PODS) 2000,Dallas, TX, 187-194), 2000 (Abstract)
  • J. Villadangos, F. Farina, J.R. Gonzales de Mendivil, J.R. Garitagoitia, J.M. Bernabeu-Auban, G. Vossen: Resolving Distributed Deadlocks in the OR Request Model (Proc. 18th IEEE Symposium on Reliable Distributed Systems 1999, Lausanne, 288-289), 1999
  • G. Vossen, M. Weske: The WASA2 Object-Oriented Workflow Management System (Proc. ACM SIGMOD International Conference on Management of Data 1999,Philadelphia, PA, 587-589 ), 1999
  • D. Laurent, J. Lechtenbörger, N. Spyratos, G. Vossen: Complements for Data Warehouses (Proc. 15th IEEE International Conference on Data Engineering (ICDE) 1999, Sydney, Australien, 490-499), 1999 (Abstract)
  • M. Weske, G. Vossen, C. Bauzer Medeiros, F. Pires: Workflow Management in Geoprocessing Applications (Proc. 6th ACM International Symposium on Geographic InformationSystems (ACMGIS) 1998, Washington, DC, 88-93), 1998
  • F. Neven, J. Van den Bussche, D. Van Gucht, G. Vossen: Typed Query Languages for Databases Containing Queries (Proc. 17th Annual ACM SIGACT-SIGMOD-SIGART Symposium on Principles of Database Systems (PODS) 1998,Seattle, WA, 189-196), 1998
  • J. Villadangos, F. Farina, A. Amatriain, G. Vossen, J.R. Gonzales de Mendivil: Performance Study of a Distributed Deadlock Resolution Algorithm for Replicated Object-Oriented Databases (Proc. 16th IASTED International Conference Applied Informatics 1998, Garmisch-Partenkirchen, 158-161), 1998
  • G. Vossen: Transactional Workflows (Proc. 5th International Conference on Deductiveand Object-Oriented Databases (DOOD) 1997, Montreux,Springer LNCS 1341, 20-25), 1997
  • T. Reuß , G. Vossen, M. Weske: Modeling SamplesProcessing in Laboratory Environments as ScientificWorkflows (Extended Abstract) (Proc. 8th International Workshop on Database and ExpertSystems Applications 1997, Toulouse, IEEE Computer Society Press,49-54), 1997
  • G. Vossen: The CORBA Specification for Cooperation inHeterogeneous Information Systems (Proc.1st International Workshop on Cooperative Information Agents (CIA)1997, Kiel, Springer LNAI 1202, 101-115), 1997
  • J. Meidanis, G. Vossen, M. Weske: Using Workflow Management in DNA Sequencing (ExtendedAbstract) (Proc. 1st IFCIS InternationalConference on Cooperative Information Systems (CoopIS) 1996,Brüssel, IEEE Computer Society Press, 114-123), 1996
  • C. Bauzer Medeiros, M. Weske, G. Vossen: GEO-WASA: CombiningGIS Technology with Workflow Management (Proc.7th Israeli Conference on Computer Systems and SoftwareEngineering 1996, Herzliya, Israel, IEEE Computer Society Press,129-139), 1996
  • J. Wainer, M. Weske, G. Vossen, C. Bauzer Medeiros: Scientific Workflow Systems (Proc. NSFWorkshop on Workflow and Process Automation in InformationSystems: State-of-the-Art and Future Directions, May 1996,Athens, Georgia, 1-5), 1996
  • C. Fahrner, G. Vossen: Transforming Relational Database Schemas into Object-Oriented Schemas according to ODMG-93 (Proc. 4th International Conference on Deductive and Object-Oriented Databases (DOOD) 1995, Singapur, Springer LNCS 1013, 429-446), 1995
  • G. Vossen: Verteilte Informationssysteme: Konzepte und Entwurfstechniken (F. Huber-Wäschle, H. Schauer, P. Widmayer (Hrsg.): GISI 95 - Herausforderungen eines globalen Informationsverbundes für die Informatik, Springer Informatik aktuell 1995, 27-34), 1995
  • C. Bauzer Medeiros, G. Vossen, M. Weske: WASA: A Workflow-Based Architecture to Support Scientific Database Applications (Extended Abstract) (Proc. 6th International Conference on Database and ExpertSystems Applications (DEXA) 1995, London, Springer LNCS 978,574-583), 1995
  • C. Fahrner, G. Vossen: Transformation relationaler Datenbank-Schemas in objekt-orientierte Schemas gemäß ODMG-93 (G. Lausen (Hrsg.): Datenbanksysteme in Büro, Technik und Wissenschaft} (Proc. 6. GI-Fachtagung BTW), Springer Informatik aktuell 1995, 111-129), 1995
  • G. Vossen: Formalization of OODB Models (Proc. KI-94 Workshops (Extended Abstracts, J. Kunze, H. Stoyan, Hrsg.), Gesellschaft für Informatik 1994, 285-286 (ausführliche Fassung im DFKI-Report D-94-11, 3-7)), 1994
  • J. Ebert, G. Vossen: On the Logical Organization of Database Support for Software Engineering Applications - Position Paper (Proc. Workshop on Research Issues in the Intersection Between Software Engineering and Databases, Sorrent), 1994
  • J. Van den Bussche, G. Vossen: An Extension of Path Expressions to Simplify Navigation in Object-Oriented Queries ( Proc. 3rd International Conference on Deductive and Object-Oriented Databases (DOOD) 1993, Phoenix, AZ, Springer LNCS 760, 267-282), 1993
  • M. Groß -Hardt, G. Vossen: Towards Class-less Object Models for Engineering Design Applications (Proc. 4th International Conference on Database and Expert Systems Applications (DEXA) 1993, Prag, Springer LNCS 720, 36-47), 1993
  • J. Van den Bussche, D. Van Gucht, G. Vossen: ReflectiveProgramming in the Relational Algebra (Proc. 12th Annual ACM SIGACT-SIGMOD-SIGART Symposium on Principles of Database Systems (PODS) 1993,Washington, DC, 17-25), 1993
  • M. Groß-Hardt, G. Vossen: Zur Entwicklung eines klassenlosen Objekt-Modells (W. Stucky, A. Oberweis (Hrsg.): Datenbanksysteme in Büro, Technik und Wissenschaft (Proc. 5. GI-Fachtagung BTW), Springer Informatik aktuell 1993, 306-315), 1993
  • G. Vossen, R. Schwarz: Dynamic Scheduling of Transactions in Design Databases based on Version Consistency (Extended Abstract) (Proc. 1st International Conference on Data Base and Expert System Applications (DEXA), Wien, Springer-Verlag 1990, 196-202), 1990
  • G. Vossen, K.U. Witt: SUXESS: Towards a Sound Unification of Extensions of the Relational Data Model (Preliminary Version) (Proc. Workshop on Foundations of Models and Languages for Data and Objects 1989, Aigen, Österreich, (erschienen als Informatik-Bericht 89/2, A. Heuer, Hg., Techn. Univ. Clausthal), 1-20), 1989
  • V. Vianu, G. Vossen: Goal-Oriented Concurrency Control (Extended Abstract) (Proc. 2nd Symposium on Mathematical Fundamentals of Database Systems (MFDBS) 1989, Visegrad, Ungarn, Springer LNCS 364, 398-414), 1989
  • S. Wang, G. Vossen: Towards Efficient Algorithms for Deadlock Detection and Resolution in Distributed Systems ( Proc. 5th IEEE International Conference on Data Engineering 1989, Los Angeles, CA, 287-294), 1989
  • V. Vianu, G. Vossen: Conceptual Level Concurrency Control of Relational Update Transactions (Extended Abstract) (Proc. 2nd International Conference on Database Theory (ICDT) 1988, Brügge, Belgien, Springer LNCS 326, 353-367), 1988
  • G. Vossen: Transactions in Universal Relation Databases (Proc. 2. Workshop über relationale Datenbanken 1986, Lessach, Österreich, (erschienen als Informatik-Bericht 86/3, A. Heuer, Hg., Techn. Univ. Clausthal), 31-44), 1986
  • G. Vossen, V. Brosda: A High-Level User-Interface for Update and Retrieval in Relational Databases - Language Aspects (Proc. Annual ACM SIGMOD International Conference on Management of Data 1985, Austin, TX, 343-353), 1985
  • V. Brosda, G. Vossen: Updating a Relational Database through a Universal Schema Interface (Proc. 4th Annual ACM SIGACT-SIGMOD Symposium on Principles of Database Systems (PODS) 1985, Portland, OR, 66-75), 1985
  • G. Vossen: On the Average-Case Performance of Certain Approximation Algorithms for the 0/1 Knapsack Problem (Extended Abstract) (Proc. 6. Symposium über Operations Research 1981, Augsburg, erschienen als Methods of Operations Research Vol. 43, 455), 1981


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