E. Mugellini, O. Khaled, S. Pierroz, S. Carrino, and H. Drissi. Human-Computer Interaction. Ambient, Ubiquitous and Intelligent Interaction, 13th International Conference, HCI International 2009, San Diego, CA, USA, July 19-24, 2009, Proceedings, Part III, volume 5612 of Lecture Notes in Computer Science, page 473--482. Springer, (2009)