@inproceedings{SIGIR-2009-WangLFXY,
	author        = "Haofen Wang and Yan Liang and Linyun Fu and Gui-Rong Xue and Yong Yu",
	booktitle     = "{Proceedings of the 32nd International ACM SIGIR Conference on Research and Development in Information Retrieval}",
	doi           = "10.1145/1571941.1571953",
	isbn          = "978-1-60558-483-6",
	pages         = "51--58",
	publisher     = "{ACM}",
	title         = "{Efficient query expansion for advertisement search}",
	year          = 2009,
}