L. de Alfaro, and T. Henzinger. Proceedings of the Joint 8th European Software Engineering Conference
and 9th ACM SIGSOFT Symposium on the Foundation of Software
Engeneering (ESEC/FSE-01), volume 26, 5 of ACM SIGSOFT Software Engineering Notes, page 109--120. New York, ACM Press, (September 2001)
K. Bharat, and M. Henzinger. Proceedings of SIGIR-98, 21st ACM International Conference on Research and Development in Information Retrieval, page 104--111. Melbourne, AU, (1998)
M. Henzinger, R. Motwani, and C. Silverstein. Proceedings of the 18th International Joint Conference on Artificial Intelligence (IJCAI'03), page 1573-1579. (2003)