Pierangela Samarati, Peter Y. A. Ryan, Dieter Gollmann, Refik Molva: Computer Security - ESORICS 2004, 9th European Symposium on Research Computer Security, Sophia Antipolis, France, September 13-15, 2004, Proceedings. Lecture Notes in Computer Science 3193, Springer 2004, ISBN 3-540-22987-6