J. Luxenburger, S. Elbassuoni, and G. Weikum. CIKM '08: Proceeding of the 17th ACM conference on Information and knowledge management, page 689--698. New York, NY, USA, ACM, (2008)
J. Espinosa, and H. Lieberman. MICAI: Fourth Mexican International Conference on Artificial Intelligence, volume 3789 of Lecture Notes in Computer Science, page 61-69. Springer, (2005)
U. Lee, Z. Liu, and J. Cho. WWW '05: Proceedings of the 14th International World Wide Web Conference, page 391--400. New York, NY, USA, ACM Press, (2005)
J. Espinosa, and H. Lieberman. MICAI: Fourth Mexican International Conference on Artificial Intelligence, volume 3789 of Lecture Notes in Computer Science, page 61-69. Springer, (2005)
H. Lieberman, and J. Espinosa. IUI '06: Proceedings of the 11th international conference on Intelligent user interfaces, page 226--233. New York, NY, USA, ACM, (2006)
J. Allan, and H. Raghavan. Proceedings of the 25th annual international ACM SIGIR Conference on Research and Development in Information Retrieval, page 307--314. ACM Press New York, NY, USA, (2002)