J. Hoernecke, M. Amelung, K. Krieger, and D. Rösner. DeLFI 2011 - Die 9. e-Learning Fachtagung Informatik der Gesellschaft für Informatik e.V., 5.-8. September 2011, Technische Universität Dresden, volume 188 of LNI, page 127--138. Bonn, GI, (2011)
M. Amelung, P. Forbig, and D. Rösner. ITiCSE '08: Proceedings of the 13th annual SIGCSE conference on Innovation and technology in computer science education, New York, NY. USA, ACM Press, (2008)