@inproceedings{SIGIR-2004-LiuC,
	author        = "Xiaoyong Liu and W. Bruce Croft",
	booktitle     = "{Proceedings of the 27th International ACM SIGIR Conference on Research and Development in Information Retrieval}",
	doi           = "10.1145/1008992.1009026",
	isbn          = "1-58113-881-4",
	pages         = "186--193",
	publisher     = "{ACM}",
	title         = "{Cluster-based retrieval using language models}",
	year          = 2004,
}