B. Heckmann, I. Stengel, A. Phippen, and G. Turetschek. ESM'2009 The 2009 European Simulation and Modelling Conference, page 175--180. Leicester, United Kingdom, EUROSIS-ETI, (October 2009)
B. Heckmann, G. Turetschek, and A. Phippen. Proceedings of the Fourth Collaborative Research Symposium on Security, E-learning, Internet and Networking, page 155--165. Wrexham, UK, (2008)
B. Heckmann. Proceedings of the Third Collaborative Research Symposium on Security, E-Learning, Internet and Networking, page 185--198. Plymouth, UK, Lulu.com, (June 2007)