@inproceedings{SIGIR-1980-RobertsonRP,
	acmid         = "636673",
	author        = "Stephen E. Robertson and C. J. van Rijsbergen and Martin F. Porter",
	booktitle     = "{Proceedings of the Joint BCS/ACM Symposium on Information Storage and Retrieval}",
	cdrom         = "SIGIR/1980/P035.pdf",
	isbn          = "408107758",
	pages         = "35--56",
	publisher     = "{Butterworths}",
	title         = "{Probabilistic Models of Indexing and Searching}",
	year          = 1980,
}