7Sandhu R S. Future direction in role - based access control models. In:Gorodetski V I, et al eds., Prec of the Mathematical Methods, Models,and Architectures for Network Security Systems. Lecture Notes in Computer Science 2052. Berlin: Springer, 2001:22 -26
8Barka E, Sandhu R. Framework for role - based delegation models. The 16th Annual Computer Security Application Conf, Sheraton New Orleans, 2000
9Sandhu B S, et al. Role- based access control models IEEE Computer, 1996;29(2): 38-47
