S. Wedig, and O. Madani. Proceedings of the 12th ACM SIGKDD international conference on Knowledge discovery and data mining, page 742--747. New York, NY, USA, ACM, (2006)
X. Shen, B. Tan, and C. Zhai. Proceedings of the 14th ACM international conference on Information and knowledge management, page 824--831. New York, NY, USA, ACM, (2005)
M. Coyle, and B. Smyth. IUI '07: Proceedings of the 12th international conference on Intelligent user interfaces, page 282--285. New York, NY, USA, ACM Press, (2007)