Tatyana Ryutov, B. Clifford Neuman. The Set and Function Approach to Modeling Authorization in Distributed Systems. In Vladimir I. Gorodetski, Victor A. Skormin, Leonard J. Popyack, editors, Information Assurance in Computer Networks: Methods, Models, and Architectures for Network Security, International Workshop MMM-ACNS 2001, St. Petersburg, Russia, May 21-23, 2001, Proceedings. Volume 2052 of Lecture Notes in Computer Science, pages 189-206, Springer, 2001. [doi]