6Ravi Sandhu,Edward Coyne,Hal Feinstein,et al.Role-based access control models[J].IEEE Computer, 1996,29(2):38-47.
7Ferraiolo D,Sandhu R,Gavrila S,et al.A proposed standard for role-based access control[J].ACM Transactions on Information and System Security,2001,4(3):224-274.