A. Kröner, P. Gebhard, L. Spassova, G. Kahl, and M. Schmitz. Workshops Proceedings of the 5th International Conference on Intelligent Environments, volume 4 of Ambient Intelligence and Smart Environments, page 21--26. Amsterdam, IOS Press, (2009)
H. Bunt, M. Kipp, M. Maybury, and W. Wahlster. Multimodal Intelligent Information Presentation, volume 27 of Text, Speech and Language Technology, Springer, Dordrecht, (2005)
R. Budiu, P. Pirolli, and M. Fleetwood. AVI '06: Proceedings of the working conference on Advanced visual interfaces, page 457--462. New York, NY, USA, ACM Press, (2006)