Udaya Kiran Tupakula Vijay Varadharajan Sunil Kumar Vuppala SBAC: Service Based Access Control. 202-209 2009 ICECCS http://dx.doi.org/10.1109/ICECCS.2009.43 conf/iceccs/2009 db/conf/iceccs/iceccs2009.html#TupakulaVV09