@inproceedings{CIKM-2012-ZhouLZ12a,
	author        = "Ke Zhou and Xin Li and Hongyuan Zha",
	booktitle     = "{Proceedings of the 21st ACM International Conference on Information and Knowledge Management}",
	doi           = "10.1145/2396761.2398540",
	isbn          = "978-1-4503-1156-4",
	pages         = "1900--1904",
	publisher     = "{ACM}",
	title         = "{Collaborative ranking: improving the relevance for tail queries}",
	year          = 2012,
}