@inproceedings{SIGIR-2009-GaoYLDN,
	author        = "Jianfeng Gao and Wei Yuan and Xiao Li and Kefeng Deng and Jian-Yun Nie",
	booktitle     = "{Proceedings of the 32nd International ACM SIGIR Conference on Research and Development in Information Retrieval}",
	doi           = "10.1145/1571941.1572003",
	isbn          = "978-1-60558-483-6",
	pages         = "355--362",
	publisher     = "{ACM}",
	title         = "{Smoothing clickthrough data for web search ranking}",
	year          = 2009,
}