Rakesh Agrawal Alan Halverson Krishnaram Kenthapadi Nina Mishra Panayiotis Tsaparas Generating labels from clicks. 172-181 2009 WSDM http://doi.acm.org/10.1145/1498759.1498824 conf/wsdm/2009 db/conf/wsdm/wsdm2009.html#AgrawalHKMT09