Qiaoming Zhu Peifeng Li Su Zhang Peide Qian A Unified Authorization Platform Based on RBAC4WAS Model for Web Application System Integration. 505-509 2005 conf/cw/2005 CW http://doi.ieeecomputersociety.org/10.1109/CW.2005.11 db/conf/cw/cw2005.html#ZhuLZQ05