Ravi Sandhu
George Mason University and SETA Corporation
Team-and-role-based organizational context and access control for cooperative hypermedia environments
Proceedings of the tenth ACM Conference on Hypertext and hypermedia : returning to our diverse roots: returning to our diverse roots
Attribute certification: an enabling technology for delegation and role-based controls in distributed environments
RBAC '99 Proceedings of the fourth ACM workshop on Role-based access control