The Multilayer Firewall. - Dan M. Nessett; Polar Humenn (NDSS, 1998)

Dynamically authorized role-based access control for secure distributed computation. - C. Joncheng Kuo; Polar Humenn (XML Security, 2002)

Implementing a Calculus for Distributed Access Control in Higher Order Logic and HOL. - Thumrongsak Kosiyatrakul; Susan Older; Polar Humenn; Shiu-Kai Chin (MMM-ACNS, 2003)