S. Hupfer, L. Cheng, S. Ross, and J. Patterson. Proceedings of ACM 2004 conference on Computer Supported Cooperative
Work (CSCW �04), ACM Press, New York, (2004)
E. Horvitz, J. Apacible, and M. Subramani. User Modeling 2005, 10th International Conference, UM 2005, Edinburgh,
Scotland, UK, July 24-29, 2005, Proceedings, volume 3538 of Lecture Notes in Computer Science, Springer, (2005)