@inproceedings{RecSys-2010-LeeB,
	author        = "Danielle H. Lee and Peter Brusilovsky",
	booktitle     = "{Proceedings of the Fourth Conference on Recommender Systems}",
	doi           = "10.1145/1864708.1864752",
	isbn          = "978-1-60558-906-0",
	pages         = "221--224",
	publisher     = "{ACM}",
	title         = "{Using self-defined group activities for improvingrecommendations in collaborative tagging systems}",
	year          = 2010,
}