@inproceedings{CIKM-2006-ZhaZFS,
	author        = "Hongyuan Zha and Zhaohui Zheng and Haoying Fu and Gordon Sun",
	booktitle     = "{Proceedings of the 15th ACM International Conference on Information and Knowledge Management}",
	doi           = "10.1145/1183614.1183660",
	isbn          = "1-59593-433-2",
	pages         = "307--316",
	publisher     = "{ACM}",
	title         = "{Incorporating query difference for learning retrieval functions in world wide web search}",
	year          = 2006,
}