@inproceedings{CIKM-2009-Collins-Thompson,
	author        = "Kevyn Collins-Thompson",
	booktitle     = "{Proceedings of the 18th ACM International Conference on Information and Knowledge Management}",
	doi           = "10.1145/1645953.1646059",
	isbn          = "978-1-60558-512-3",
	pages         = "837--846",
	publisher     = "{ACM}",
	title         = "{Reducing the risk of query expansion via robust constrained optimization}",
	year          = 2009,
}