On the Design and the Implementation of Secure Xenix Workstations. - Virgil D. Gligor; E. L. Burch; C. Sekar Chandersekaran; Robert S. Chapman; Leslie J. Dotterer; Matthew S. Hecht; Wen-Der Jiang; Gary L. Luckenbaugh; N. Vasudevan (S&P, 1986)