Barbara Carminati Elena Ferrari Raymond Heatherly Murat Kantarcioglu Bhavani M. Thuraisingham A semantic web based framework for social network access control. 177-186 2009 SACMAT http://doi.acm.org/10.1145/1542207.1542237 conf/sacmat/2009 db/conf/sacmat/sacmat2009.html#CarminatiFHKT09