@inproceedings{RecSys-2009-MaLK,
	author        = "Hao Ma and Michael R. Lyu and Irwin King",
	booktitle     = "{Proceedings of the Third Conference on Recommender Systems}",
	doi           = "10.1145/1639714.1639746",
	isbn          = "978-1-60558-435-5",
	pages         = "189--196",
	publisher     = "{ACM}",
	title         = "{Learning to recommend with trust and distrust relationships}",
	year          = 2009,
}