R. Baecker, D. Nastos, I. Posner, and K. Mawby. Proceedings of the conference on Human factors in computing systems, page 399--405. Addison-Wesley Longman Publishing Co., Inc., (1993)
C. Neuwirth, D. Kaufer, R. Chandhok, and J. Morris. Proceedings of the 1994 ACM conference on Computer supported cooperative work, page 145--152. ACM Press, (1994)
M. Sharples. Computer Supported Collaborative Writing, chapter 1, Springer, Berlin, Heidelberg, New York, Computer Supported Cooperative Work edition, (1993)
T. Jokela, N. Iivari, J. Matero, and M. Karukka. Proceedings of the Latin American conference on Human-computer interaction, page 53--60. ACM Press, (2003)