user- Proceedins of the 34th Annual Conference of the German Classification Society, Berlin, Springer, (forthcoming)
- Operations Research Proceedings 2008, page 419 - 424. Berlin, Springer, (2009)
- Consumer Citizenship Network: Making a Difference - Putting Consumer Citizenship into Action, page 163 -- 177. Berlin, The Consumer Citizenship Network, an Erasmus thematic network of educators and researchers, (2009)
- Proceedings of the 38th EMAC Conference, Marketing and the Core Disciplines: Rediscovering References?, Nantes, (2009)
- Classification as a Tool for Research, page 553-560. Berlin, Springer, (2010)
- Proceedings of Australia \& New Zealand Marketing Academy 2010 Conference, Christchurch New Zealand, Department of Management, University of Canterbury, (2010)
- Proceedings of 4th International Biennale on Commercial Negotiation, Paris, (2010)
- Proceedings of Australia \& New Zealand Marketing Academy 20009 Conference, page 1-8. (2009)
- Verfügbarkeit von Informationen, Proceedings der 30. Online-Tagung der DGI / 60. Jahrestagung der DGI, Frankfurt, DGI, (2008)
- 514. Fakultät für Wirtschaftswissenschaften, Universität Bielefeld, (2004)
- Proceedings of OR 2005, page 613 - 618. Berlin, Springer, (2006)
- Tagungsband der Jahrestagung des Institute for Competitive Intelligence, page 8--22. (2010)
- Cooperation in Classification and Data Analysis, page 161-168. Berlin, Springer, (2009)
- Advances in Data Analysis, Data Handling and Business Intelligence, page 545-552. Berlin, Springer, (2009)
- Data Science and Classification, page 279 -- 286. Berlin, Springer, (2006)
- Information: Droge, Ware oder Commons? Wertschöpfungs- und Transformationsprozesse auf den Informationsmärkten, page 147 -- 158. Boizenburg, VHW-Verlag, (2009)
- Cooperation in Classification and Data Analysis, page 99 - 106. Berlin, Springer, (2009)
- Proceedings of the 12th International Conference on Corporate Reputation, Brand Identity, and Competitiveness, Beijing, (2008)
- Proceedings of the 2008 AMS Cultural Perspectives in Marketing Conference, page 115 - 120. New Orleans, Academy of Marketing Science, (2008)
- Proceedings of the 37th EMAC Conference, Marketing Landscapes: A Pause for Thought, Brighton, (2008)
