@inproceedings{SIGIR-1981-Robertson,
	author        = "Stephen E. Robertson",
	booktitle     = "{Proceedings of the Fourth International Conference on Information Storage and Retrieval}",
	cdrom         = "SIGIR1981/P022.pdf",
	doi           = "10.1145/511754.511758",
	isbn          = "0-89791-052-4",
	pages         = "22--29",
	publisher     = "{ACM}",
	title         = "{Term Frequency and Term Value}",
	year          = 1981,
}