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)
R. Baggetun, E. Rusman, and C. Poggi. Proceedings of World Conference on Educational Multimedia, Hypermedia and Telecommunications, 1, page 2493--2498. Lugano, Switzerland, AACE, (2004)
M. Göstl, R. Kammerl, and F. Weitl. Proceedings of ED-MEDIA 2004, World Conference on Educational Multimedia, Hypermedia & Telecommunications, Lugano, (2004)