J. Allan, R. Gupta, и V. Khandelwal. SIGIR '01: Proceedings of the 24th annual international ACM SIGIR conference on Research and development in information retrieval, стр. 10--18. New York, NY, USA, ACM, (2001)
J. Allan, V. Lavrenko, и H. Jin. CIKM '00: Proceedings of the ninth international conference on Information and knowledge management, стр. 374--381. New York, NY, USA, ACM, (2000)