@inproceedings{SIGIR-2007-WuLW,
	author        = "Ho Chung Wu and Robert W. P. Luk and Kam-Fai Wong",
	booktitle     = "{Proceedings of the 30th International ACM SIGIR Conference on Research and Development in Information Retrieval}",
	doi           = "10.1145/1277741.1277872",
	isbn          = "978-1-59593-597-7",
	pages         = "713--714",
	publisher     = "{ACM}",
	title         = "{Probability ranking principle via optimal expected rank}",
	year          = 2007,
}