D. Lalanne, L. Nigay, P. Palanque, P. Robinson, J. Vanderdonckt, and J. Ladr. IMCI-MLMI '09: Proceedings of the 11th International Conference on Multimodal Interfaces and the 6th Workshop on Machine Learning for Multimodal Interfaces, Cambridge, MA, USA, page 153-160. (2009)
J. Schehl, A. Pfalzgraf, N. Pfleger, and J. Steigner. Proceedings of the 10th International Conference on Multimodal Interfaces (ICMI '08), Chania, Crete, Greece, page 77-80. (2008)