- Das Projekt GETESS wurde von September 1998 bis Juni 2001 vom Bundesministerium für Bildung und Forschung gefördert.
- WWW, page 114-118. (2001)
- Kluwer International Series in Engineering an Kluwer Academic Publishers, Boston, MA, USA, (2002)
- Mobiles Lernen und Forschen - Beiträge der Fachtagung an der Universität, page 93-104. Kassel University Press, (November 2003)
- Proceedings of the International Workshop on Web Dynamics, held in conj. with the 8th International Conference on Database Theory ICDT’01, London, UK, (2001)
- IEEE Intelligent Systems 16(2):60--71 (2001)
- Knowledge-Based Systems (December 2006)
- Proceedings of the tenth ACM international conference on Multimedia MM-02, page 235--238. New York, ACM Press, (December 2002)
- Harper San Francisco, (1999)
- Computer Network and ISDN Systems (April 1998)
- International Semantic Web Working Symposium, Stanford, USA, (2001)
- Proceedings ACM Conference on Intelligent User Interfaces IUI, page 191-197. (2004)
- Scientific American 284(5):34-43 (2001)
- SMI-2001-0880. Stanford University School of Medicine, (2001)


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