David Vallet Frank Hopfgartner Joemon M. Jose Use of Implicit Graph for Recommending Relevant Videos: A Simulated Evaluation. 199-210 2008 ECIR http://dx.doi.org/10.1007/978-3-540-78646-7_20 conf/ecir/2008 db/conf/ecir/ecir2008.html#ValletHJ08