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)
M. Smucker, and J. Allan. SIGIR '06: Proceedings of the 29th annual international ACM SIGIR conference on Research and development in information retrieval, page 461--468. New York, NY, USA, ACM Press, (2006)