K. Hofmann, B. Huurnink, M. Bron, and M. de Rijke. Proceeding of the 33rd international ACM SIGIR conference on Research and development in information retrieval, page 761--762. New York, NY, USA, ACM, (2010)
I. Soboroff, C. Nicholas, and P. Cahan. Proceedings of the 24th annual international ACM SIGIR conference on Research and development in information retrieval, page 66--73. New York, NY, USA, ACM, (2001)
T. Sakai, and C. Lin. the 3rd International Workshop on Evaluating Information Access (EVIA) --- A Satellite Workshop of NTCIR-8, page 25--33. Tokyo, Japan, National Institute of Informatics, (June 2010)
R. Fagin, R. Kumar, and D. Sivakumar. SODA '03: Proceedings of the fourteenth annual ACM-SIAM symposium on Discrete algorithms, page 28--36. Philadelphia, PA, USA, Society for Industrial and Applied Mathematics, (2003)