T. Blanc-Brude, and D. Scapin. IUI '07: Proceedings of the 12th international conference on Intelligent user interfaces, page 102--111. New York, NY, USA, ACM Press, (2007)
J. Patten, and H. Ishii. DARE '00: Proceedings of DARE 2000 on Designing augmented reality environments, page 41--50. New York, NY, USA, ACM Press, (2000)