C. de Souza, S. Quirk, E. Trainer, and D. Redmiles. Proceedings of the 2007 international ACM conference on Supporting group work, page 147--156. New York, NY, USA, ACM, (2007)
G. Fitzpatrick, P. Marshall, and A. Phillips. CSCW '06: Proceedings of the 2006 20th anniversary conference on Computer supported cooperative work, page 49--58. New York, NY, USA, ACM Press, (2006)