Jinwei Hu Ruixuan Li Zhengding Lu Establishing RBAC-Based Secure Interoperability in Decentralized Multi-domain Environments. 49-63 2007 conf/icisc/2007 ICISC http://dx.doi.org/10.1007/978-3-540-76788-6_5 db/conf/icisc/icisc2007.html#HuLL07