@inproceedings{SIGIR-2011-LiuSL,
	author        = "Jing Liu and Young-In Song and Chin-Yew Lin",
	booktitle     = "{Proceedings of the 34th International ACM SIGIR Conference on Research and Development in Information Retrieval}",
	doi           = "10.1145/2009916.2009975",
	isbn          = "978-1-4503-0757-4",
	pages         = "425--434",
	publisher     = "{ACM}",
	title         = "{Competition-based user expertise score estimation}",
	year          = 2011,
}