D. Cram, A. Kröner, and A. Mille. Workshops Proceedings of the 5th International Conference on Intelligent Environments, volume 4 of Ambient Intelligence and Smart Environments, page 45--50. Amsterdam, IOS Press, (2009)
C. Elting, S. Rapp, G. Möhler, and M. Strube. Proceedings of the 5th International Conference on Multimodal Interfaces (ICMI '03), Vancouver, Canada, page 93-100. (2003)
B. Kirman, C. Linehan, S. Lawson, D. Foster, and M. Doughty. Proceedings of the ACM Conference Extended Abstracts on Human Factors in Computing Systems (CHI EA '10), Atlanta, GA, USA, page 2685--2694. (2010)