J. Pérez-Medina, S. Dupuy-Chessa, and A. Front. Proceedings of the 6th international conference on Task models and diagrams for user interface design, page 84--97. Berlin/Heidelberg, Springer-Verlag, (2007)
F. Paternò, C. Santoro, and L. Spano. Proceedings of the 12th IFIP TC 13 International Conference on Human-Computer Interaction: Part I, page 892--905. Berlin/Heidelberg, Springer-Verlag, (2009)
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)
A. Neto, R. Fortes, and A. da Silva Filho. Proceedings of the 26th annual ACM international conference on Design of communication, page 277--278. New York, NY, USA, ACM, (2008)