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- Proceedings of World Conference on Educational Multimedia, Hypermedia and Telecommunications 2002, page 2005--2006. Denver, Colorado, USA, AACE, (2002)
- Computer Networks and ISDN Systems. Proceedings of the Seventh International World Wide Web Conference, 30, page 107-117. Elsevier, (1998)
- UVK, Konstanz, (1998)
- (1998)
- page 107-117. Elsevier, (1998)
- Review of Educational Research, 68 (3): 249-76 (1998)
- California Management Review, 40 (3): 40--54 (1998)
- Frankfurter Allg., Zeitung für Deutschland u.a., Frankfurt am Main, 2. Aufl edition, (1998)
- Organization Science, 8 (5): pp. 475-488 (1997)
- Campus, Frankfurt a.M., New York, (1997)
- J. Manage. Inf. Syst., (March 1996)
- Longman, (1996)
- Journal of the American Society for Information Science, 45 (3): 149--159 (1994)
- Int. J. Man-Mach. Stud., 38 (3): 475--487 (March 1993)
- Neue Perspektiven der Kooperation – ausgewählte Beiträge der Internationalen Konferenz 1992 über kooperatives Lernen, page 51-170. Hohengehren, Schneider, (1993)
- CroomHelm, Kent, (1984)
- Journal of Personality and social Psychology,, (1979)
- Addison-Wesley, Reading, MA, (1975)
- Science, (1972)
