X. Liu, and W. Croft. Proceedings of the 27th Annual International ACM SIGIR Conference on Research and Development in Information Retrieval, page 186--193. New York, NY, USA, ACM, (2004)
X. Liu, and W. Croft. Proceedings of the 27th Annual International ACM SIGIR Conference on Research and Development in Information Retrieval, page 186--193. New York, NY, USA, ACM, (2004)
D. Lawrie, and W. Croft. Proceedings of the 26th Annual International ACM SIGIR Conference on Research and Development in Information Retrieval, SIGIR 2003, page 457--458. (2003)