C. Lampe, N. Ellison, and C. Steinfield. Proceedings of the 2006 20th anniversary conference on Computer supported cooperative work, page 167--170. New York, NY, USA, ACM, (2006)
P. Ludford, D. Cosley, D. Frankowski, and L. Terveen. Proceedings of the SIGCHI conference on Human factors in computing systems, page 631--638. New York, NY, USA, ACM, (2004)
D. Cosley, D. Frankowski, L. Terveen, and J. Riedl. Proceedings of the SIGCHI conference on Human Factors in computing systems, page 1037--1046. New York, NY, USA, ACM, (2006)
O. Boydell, and B. Smyth. IUI '07: Proceedings of the 12th international conference on Intelligent user interfaces, page 42--51. New York, NY, USA, ACM Press, (2007)
J. Freyne, R. Farzan, P. Brusilovsky, B. Smyth, and M. Coyle. IUI '07: Proceedings of the 12th international conference on Intelligent user interfaces, page 52--61. New York, NY, USA, ACM, (2007)
R. Almeida, and V. Almeida. WWW '04: Proceedings of the 13th international conference on World Wide Web, page 413--421. New York, NY, USA, ACM Press, (2004)
R. Cheng, and J. Vassileva. User Modeling 2005, volume 3538 of Lecture Notes in Computer Science, chapter 43, Springer Berlin / Heidelberg, Berlin, Heidelberg, (2005)