@inproceedings{KDD-2010-Steck,
	author        = "Harald Steck",
	booktitle     = "{Proceedings of the 16th International Conference on Knowledge Discovery and Data Mining}",
	doi           = "10.1145/1835804.1835895",
	isbn          = "978-1-4503-0055-1",
	pages         = "713--722",
	publisher     = "{ACM}",
	title         = "{Training and testing of recommender systems on data missing not at random}",
	year          = 2010,
}