J. Sarmiento, S. Trausan-Matu, and G. Stahl. presented at the International Symposium on Organizational Learning and Knowledge Work Management (OL-KWM 2005), page 88-99. Bucharest, Romania, (2005)
J. Carroll, G. Chin, M. Rosson, and D. Neale. DIS '00: Proceedings of the conference on Designing interactive systems, page 239--251. New York, NY, USA, ACM Press, (2000)