T. Tergan. (2008)Proc. of the Third Int. Conference on Concept Mapping
Tallinn, Estonia & Helsinki, Finland 2008
http://cmc.ihmc.us/cmc2008/cmc2008Program.html.
U. Cress, and J. Kimmerle. International Journal of Computer-Supported Collaborative Learning, 3 (2):
105--122(June 2008)doi=10.1007/s11412-007-9035-z.
R. Budiu, P. Pirolli, and M. Fleetwood. AVI '06: Proceedings of the working conference on Advanced visual interfaces, page 457--462. New York, NY, USA, ACM Press, (2006)
D. Liben-Nowell, and J. Kleinberg. CIKM '03: Proceedings of the twelfth international conference on Information and knowledge management, page 556--559. New York, NY, USA, ACM, (2003)
J. Baumeister, and G. Nalepa. FLAIRS'09: Proceedings of the 22th International Florida Artificial Intelligence Research Society Conference, page 384-389. AAAI Press, (2009)
J. Moskaliuk, J. Kimmerle, and U. Cress. Proceedings of the International Conference of the Learning Sciences 2008(Bd. 2, S. 99-106). Utrecht, The Netherlands: International Society of the Learning Sciences, page 99-106. (2008)