Benjamin Markines Ciro Cattuto Filippo Menczer Dominik Benz Andreas Hotho Gerd Stumme Evaluating similarity measures for emergent semantics of social tagging. 641-650 2009 WWW http://doi.acm.org/10.1145/1526709.1526796 conf/www/2009 db/conf/www/www2009.html#MarkinesCMBHS09