Unit 2c – Firewalls, Intrusion Detection and Protection Systems Boyle and Panko: Chapter 6 Firewalls Basile, C., Matteo, M.C., Mutti, S. and Paraboschi, S, “Detection of Conflicts in Security Policies”, in Vacca, J.R. (2017) Computer and Information Security Handbook, Third Edition, Chapter 55. pp. 781-799.