S. Shaw, and J. Hudson. E-Learn 2004: World Conference on E-Learning in Corporate, Government, Healthcare & Higher Education, page 1694--1698. Chesapeake, VA, Association for the Advancement of Computing in Education (AACE), AACE, (2004)
K. Verbert, J. Klerkx, M. Meire, J. Najjar, and E. Duval. On the Move to Meaningful Internet Systems 2004, volume 3292 of Lecture Notes in Computer Science, page 713-722. Berlin, Heidelberg, Springer, (2004)
E. Fernandes, H. Madhour, S. Miniaoui, and M. Forte. IEEE International Conference on Advanced Learning Technologies // Fifth IEEE International Conference on Advanced Learning Technologies, 2005, IEEE Computer Society, Los Alamitos, Calif, (2005)