Jan Peters Roland Rieke Taufiq Rochaeli Björn Steinemann Ruben Wolf A Holistic Approach to Security Policies - Policy Distribution with XACML over COPS. 143-157 2007 168 Electr. Notes Theor. Comput. Sci. http://dx.doi.org/10.1016/j.entcs.2006.08.025 db/journals/entcs/entcs168.html#PetersRRSW07