M. Sanderson, и W. Croft. Proceedings of the 22nd Annual International ACM SIGIR Conference on Research and Development in Information Retrieval, SIGIR'99, стр. 206--213. (1999)
D. Lawrie, и W. Croft. Proceedings of the 26th Annual International ACM SIGIR Conference on Research and Development in Information Retrieval, SIGIR 2003, стр. 457--458. (2003)
M. Sanderson, и W. Croft. Proceedings of the 22nd Annual International ACM SIGIR Conference on Research and Development in Information Retrieval, SIGIR'99, стр. 206--213. (1999)