J. Pérez-Medina, S. Dupuy-Chessa, und A. Front. Proceedings of the 6th international conference on Task models and diagrams for user interface design, Seite 84--97. Berlin/Heidelberg, Springer-Verlag, (2007)
J. Pérez-Medina, S. Dupuy-Chessa, und A. Front. Task Models and Diagrams for User Interface Design, Volume 4849 von Lecture Notes in Computer Science, Springer, Berlin / Heidelberg, (2007)