E. Gouli, A. Gogoulou, и M. Grigoriadou. Proceedings of the ED-MEDIA 2006, World Conference on Educational Multimedia, Hypermedia & Telecommunications, (2006)
Y. Kali, и M. Ronen. Computer support for collaborative learning: The Next 10 Years! Proceedings of CSCL 2005 (Taipei, Taiwan), Mahwah, NJ, Lawrence Erlbaum Associates, (2005)