Schyn, A., Navarre, D., Palanque, P., and Porcher Nedel, L. 2003. Formal description of a multimodal interaction technique in an immersive virtual reality application. In Proceedings of the 15th French-Speaking Conference on Human–Computer interaction on 15eme Conference Francophone Sur L'interaction Homme–Machine (Caen, France, November 25–28, 2003). T. Baudel, Ed. IHM 2003, vol. 51. ACM, New York, NY, 150–157.