M. Hsu, and H. Chen. SIGIR '06: Proceedings of the 29th annual international ACM SIGIR conference on Research and development in information retrieval, page 651--652. New York, NY, USA, ACM, (2006)
M. Smucker, J. Allan, and B. Carterette. CIKM '07: Proceedings of the sixteenth ACM conference on Conference on information and knowledge management, page 623--632. New York, NY, USA, ACM, (2007)
G. Kumaran, and J. Allan. SIGIR '08: Proceedings of the 31st annual international ACM SIGIR conference on Research and development in information retrieval, page 11--18. New York, NY, USA, ACM, (2008)
G. Kumaran, and J. Allan. Proceedings of Human Language Technologies: The Annual Conference of the North American Chapter of the Association for Computational Linguistics, page 220--227. (2006)