J. P. de Albuquerque, H. Isenberg, H. Krumm, and P. L. de Geus. Improving the Configuration Management of Large Network Security Systems. Ambient Networks: 16th IFIP/IEEE International Workshop on Distributed Systems: Operations and Management, DSOM 2005, Proceedings, Springer-Verlag, volume 3775, pages 36-47, October 2005.