D. Parra, and P. Brusilovsky. RecSys '09: Proceedings of the third ACM conference on Recommender systems, page 237--240. New York, NY, USA, ACM, (2009)
R. Fielding, and R. Taylor. ICSE '00: Proceedings of the 22nd international conference on Software engineering, page 407--416. New York, NY, USA, ACM, (2000)
J. Vig, S. Sen, and J. Riedl. IUI '09: Proceedings of the 13th international conference on Intelligent user interfaces, page 47--56. New York, NY, USA, ACM, (2009)