S. Balbo, D. Draheim, C. Lutteroth, and G. Weber. Proceedings of the 4th international workshop on Task models and diagrams, page 111--118. New York, NY, USA, ACM, (2005)
M. Blumendorf, G. Lehmann, and S. Albayrak. Proceedings of the 2nd ACM SIGCHI symposium on Engineering interactive computing systems, page 9--18. New York, NY, USA, ACM, (2010)
M. Blumendorf, G. Lehmann, S. Feuerstack, and S. Albayrak. Interactive Systems. Design, Specification, and Verification, volume 5136 of Lecture Notes in Computer Science, chapter 22, Springer-Verlag, Berlin/Heidelberg, (2008)
P. Guyot, and S. Honiden. Proceedings of the 6th International Joint Conference on Autonomous Agents and Multiagent Systems, page 1257-1259. New York, NY, USA, Association for Computing Machinery, (2007)