@inproceedings{CIKM-2003-LiC,
	author        = "Xiaoyan Li and W. Bruce Croft",
	booktitle     = "{Proceedings of the 12th ACM International Conference on Information and Knowledge Management}",
	doi           = "10.1145/956863.956951",
	isbn          = "1-58113-723-0",
	pages         = "469--475",
	publisher     = "{ACM}",
	title         = "{Time-based language models}",
	year          = 2003,
}