@inproceedings{RecSys-2009-AmatriainPTO,
	author        = "Xavier Amatriain and Josep M. Pujol and Nava Tintarev and Nuria Oliver",
	booktitle     = "{Proceedings of the Third Conference on Recommender Systems}",
	doi           = "10.1145/1639714.1639744",
	isbn          = "978-1-60558-435-5",
	pages         = "173--180",
	publisher     = "{ACM}",
	title         = "{Rate it again: increasing recommendation accuracy by user re-rating}",
	year          = 2009,
}