@inproceedings{SIGIR-2006-DingLP,
	author        = "Chris H. Q. Ding and Tao Li and Wei Peng",
	booktitle     = "{Proceedings of the 29th International ACM SIGIR Conference on Research and Development in Information Retrieval}",
	doi           = "10.1145/1148170.1148295",
	isbn          = "1-59593-369-7",
	pages         = "641--642",
	publisher     = "{ACM}",
	title         = "{NMF and PLSI: equivalence and a hybrid algorithm}",
	year          = 2006,
}