Major components of the gravity recommendation system.

Gábor Takács István Pilászy Bottyán Németh Domonkos Tikk Major components of the gravity recommendation system. 80-83 2007 9 SIGKDD Explorations 2 http://doi.acm.org/10.1145/1345448.1345466 db/journals/sigkdd/sigkdd9.html#TakacsPNT07