D. McDonald, and M. Ackerman. Proceedings of the 2000 ACM conference on Computer supported cooperative work, page 231--240. New York, NY, USA, ACM, (2000)
D. McDonald, and M. Ackerman. Proceedings of the 2000 ACM conference on Computer supported cooperative work, page 231--240. New York, NY, USA, ACM, (2000)