K. Baker, S. Greenberg, and C. Gutwin. CSCW '02: Proceedings of the 2002 ACM conference on Computer supported cooperative work, page 96-105. New York, NY, USA, ACM Press, (2002)
N. Preguica, J. Martins, H. Domingos, and S. Duarte. CSCW '00: Proceedings of the 2000 ACM conference on Computer supported cooperative work, page 69-78. New York, NY, USA, ACM Press, (2000)
A. Bullock, and S. Benford. GROUP '99: Proceedings of the international ACM SIGGROUP conference on Supporting group work, page 140-149. New York, NY, USA, ACM Press, (1999)
C. Steinfield, C. Jang, and B. Pfaff. GROUP '99: Proceedings of the international ACM SIGGROUP conference on Supporting group work, page 81-90. New York, NY, USA, ACM Press, (1999)