1. Role based access control with spatiotemporal context for mobile applications;Aich,2009
2. STARBAC: spatio temporal role based access control;Aich,2007
3. Efficient symbolic automated analysis of administrative attribute-based RBAC-policies;Alberti,2011
4. Safety analysis for the extended schematic Protection model;Ammann,1991
5. A role based delegation model and some extensions;Barka,2000