1. Amoroso, E.: Intrusion Detection: An Introduction to Internet Surveillance, Correlation, Traps, Trace Back, and Response, Intrusion.Net Books, 1999.
2. Badger, L., Sterne, D. F., Sherman, D. L., Walker, K. M.: A Domain and Type Enforcement UNIX Prototype, USENIX Computing Systems, Vol. 9, Cambridge, Massachusetts, 1996.
3. Bartal, Y., Mayer, A., Nissim, K., Wool, A.: Firmato: a novel firewall management toolkit, Proceedings of IEEE Symposium on Security and Privacy, pp. 17–31, 1999.
4. Bellovin, S. M.: Distributed Firewalls, login:, November 1999, pp. 37–39.
5. Blaze, M., Feigenbaum, J., Ioannidis, J., Keromytis, A. D.: The KeyNote trust management system, version 2•Internet RFC 2704•Sept. 1999.