J. Nicaud, H. Chaachoua, M. Bittar, and D. Bouhineau. Workshop on Usage Analysis in Learning Systems, Proceedings of Artificial Intelligence in Education, Amsterdam, (2005)
K. Sedighian, and A. Sedighian. 18th Annual Meeting of the International Group for the Psychology of Mathematics Education -- the North American Chapter, Florida, USA, (1996)
J. Carroll, G. Chin, M. Rosson, and D. Neale. DIS '00: Proceedings of the conference on Designing interactive systems, page 239--251. New York, NY, USA, ACM Press, (2000)