@inproceedings{SIGIR-1997-GreiffCT,
	author        = "Warren R. Greiff and W. Bruce Croft and Howard R. Turtle",
	booktitle     = "{Proceedings of the 20th International ACM SIGIR Conference on Research and Development in Information Retrieval}",
	cdrom         = "SIGIR1997/P119.pdf",
	doi           = "10.1145/258525.258547",
	pages         = "119--128",
	publisher     = "{ACM}",
	title         = "{Computationally Tractable Probabilistic Modeling of Boolean Operators}",
	year          = 1997,
}