B. Dumas, D. Lalanne, D. Guinard, R. Koenig, and R. Ingold. TEI '08: Proceedings of the 2nd International Conference on Tangible and Embedded Interaction, Bonn, Germany, page 47-54. (2008)
A. Blandford, P. Curzon, J. Hyde, and G. Papatzanis. Interactive Systems: Design, Specification, and Verification, 15th International Workshop, DSV-IS 2008, Kingston, Canada, (2008)