J. Lugrin, M. Cavazza, M. Palmer, and S. Crooks. Proceedings of the First international conference on Intelligent Technologies for Interactive Entertainment, page 74--83. Berlin, Heidelberg, Springer-Verlag, (2005)
J. Lugrin, R. Chaignon, and M. Cavazza. Proceedings of the 2007 6th IEEE and ACM International Symposium on Mixed and Augmented Reality, page 1--2. Washington, DC, USA, IEEE Computer Society, (2007)