@inproceedings{SIGIR-2004-FangTZ,
	author        = "Hui Fang and Tao Tao and ChengXiang Zhai",
	booktitle     = "{Proceedings of the 27th International ACM SIGIR Conference on Research and Development in Information Retrieval}",
	doi           = "10.1145/1008992.1009004",
	isbn          = "1-58113-881-4",
	pages         = "49--56",
	publisher     = "{ACM}",
	title         = "{A formal study of information retrieval heuristics}",
	year          = 2004,
}