@inproceedings{SIGIR-1994-RobertsonW,
	acmid         = "188561",
	author        = "Stephen E. Robertson and Steve Walker",
	booktitle     = "{Proceedings of the 17th International ACM SIGIR Conference on Research and Development in Information Retrieval (Special Issue of the SIGIR Forum)}",
	cdrom         = "SIGIR1994/P232.pdf",
	isbn          = "3-540-19889-X",
	pages         = "232--241",
	publisher     = "{Springer-Verlag}",
	title         = "{Some Simple Effective Approximations to the 2-Poisson Model for Probabilistic Weighted Retrieval}",
	year          = 1994,
}