Einat Amitay David Carmel Nadav Har'El Shila Ofek-Koifman Aya Soffer Sivan Yogev Nadav Golbandi Social search and discovery using a unified approach. 1211-1212 2009 WWW http://doi.acm.org/10.1145/1526709.1526933 conf/www/2009 db/conf/www/www2009.html#AmitayCHOSYG09