A. Pintus, F. Paternò, and C. Santoro. WEBIST 2010, Proceedings of the 6th International Conference on Web Information Systems and Technologies, Volume 2, page 175--180. (2010)
K. Sousa, H. Mendonça, and J. Vanderdonckt. Task Models and Diagrams for User Interface Design, volume 5963 of Lecture Notes in Computer Science, Springer Berlin Heidelberg, (2010)