V. Stein, R. Neßelrath, and J. Alexandersson. Proceedings of the 2nd International Conference on Computer Supported Education CSEDU 2010. 2nd International Conference on Computer Supported Education (CSEDU-10), (April 2010)
R. Aviv, Z. Erlich, and G. Ravid. The 3rd IEEE International Conference on Advanced Learning Technologies, 2003. Proceedings, page 145 -- 149. (July 2003)