J. Schulte, R. keil, J. Rybka, and F. Ferber. Proceedings of the 13th International Conference on Enterprise Information Systems, 4, page 407-412. Beijing, China, INSTICC, SciTePress - Science and Technology Publications, (June 2011)
J. Schulte, T. Hampel, M. Gießmann, F. Ferber, and K. Stark. DeLFI 2008: Die 6. e-Learning Fachtagung Informatik, 978-3-88579-226-0, page 101--112. Gesellschaft für Informatik e.V. (GI), Silke Seehusen and Ulrike Lucke and Stefan Fischer, (September 2008)