B. Choi, K. Alexander, R. Kraut, and J. Levine. Proceedings of the 2010 ACM conference on Computer supported cooperative work, page 107--116. New York, NY, USA, ACM, (2010)
R. Farzan, and P. Brusilovsky. Adaptive Hypermedia and Adaptive Web-Based Systems: 4th International Conference, AH 2006, volume 4018 of Lecture Notes in Computer Science, page 91--100. Berlin, Springer Verlag, (2006)
D. Cosley, D. Frankowski, L. Terveen, and J. Riedl. CHI '06: Proceedings of the SIGCHI conference on Human Factors in computing systems, page 1037--1046. New York, NY, USA, ACM Press, (2006)