K. Kamei, K. Shinozawa, T. Ikeda, A. Utsumi, T. Miyashita, and N. Hagita. Proceedings of the 12th International Conference on Multimodal Interfaces and the 7th Workshop on Machine Learning for Multimodal Interfaces (IMCI-MLMI 2010), Beijing, China, page 19:1--19:8. (2010)
G. Broll, S. Keck, P. Holleis, and A. Butz. Proceedings of MobileHCI '09: 11th International Conference on Human Computer Interaction with Mobile Devices and Services, Bonn, Germany, (2009)
B. Brandherm, J. Haupert, A. Kröner, M. Schmitz, and F. Lehmann. PerCom 2010 Workshops: Proceedings of the 8th Annual IEEE International Conference on Pervasive Computing and Communications Workshops, Mannheim, Germany, page 768-771. (2010)
B. Brandherm, and A. Kröner. Proceedings of the Seventh International Conference on Intelligent Environments (IE 2011), Nottingham, UK, page 374--377. Los Alamitos, CA, IEEE Computer Society, (2011)