Mark Meiss Filippo Menczer Santo Fortunato Alessandro Flammini Alessandro Vespignani Ranking web sites with real user traffic. 65-76 2008 conf/wsdm/2008 WSDM http://doi.acm.org/10.1145/1341531.1341543 db/conf/wsdm/wsdm2008.html#MeissMFFV08