1. On an authorization mechanism;Fagin;ACM Trans. Database Systems,1978
2. An authorization mechanism for a relational database system;Griffiths;ACM Trans. Database Systems,1976
3. Vertically and horizontally bounded propagation of privileges;Jitmedha,1984
4. Classes of authorization systems with bounded propagation;Leiss,1982
5. Principles of Data Security;Leiss,1982