Pasquale De Meo Antonino Nocera Giovanni Quattrone Domenico Rosaci Domenico Ursino Finding reliable users and social networks in a social internetworking system. 173-181 2009 IDEAS http://doi.acm.org/10.1145/1620432.1620450 conf/ideas/2009 db/conf/ideas/ideas2009.html#MeoNQRU09