@inproceedings{RecSys-2009-ParameswaranG,
	author        = "Aditya G. Parameswaran and Hector Garcia-Molina",
	booktitle     = "{Proceedings of the Third Conference on Recommender Systems}",
	doi           = "10.1145/1639714.1639786",
	isbn          = "978-1-60558-435-5",
	pages         = "353--356",
	publisher     = "{ACM}",
	title         = "{Recommendations with prerequisites}",
	year          = 2009,
}