Representing TCP/IP Connectivity For Topological Analysis of Network Security. - Ronald W. Ritchey; Brian O'Berry; Steven Noel (ACSAC, 2002)

Efficient Minimum-Cost Network Hardening Via Exploit Dependency Graphs. - Steven Noel; Sushil Jajodia; Brian O'Berry; Michael Jacobs 001 (ACSAC, 2003)