1. Virtual security appliance,
http://en.wikipedia.org/wiki/Virtual_security_appliance
2. Snort: An open-source network intrusion prevention and detection system by sourcefire,
http://www.snort.org/
3. Virtual Security Appliance Survey: What’s Really Going On?
http://www.idc.com/getdoc.jsp?containerId=220767
4. Garfinkel, T., Rosenblum, M.: A Virtual Machine Introspection Based Architecture for Intrusion Detection. In: Proceedings of the 10th Annual Network and Distributed System Security Symposium (February 2003)
5. Joshi, A., King, S.T., Dunlap, G.W., Chen, P.M.: Detecting Past and Present Intrusions through Vulnerability-specific Predicates. In: Proceedings of the 2005 SOSP (October 2005)