M. Cavazza, S. Hartley, J. Lugrin, and M. Le Bras. Proceedings of the ACM symposium on Virtual reality software and technology, page 100--107. New York, NY, USA, ACM, (2003)
M. Cavazza, S. Hartley, J. Lugrin, and M. Le Bras. Proceedings of the 9th international conference on Intelligent User Interfaces, page 54--61. New York, NY, USA, ACM, (2004)