F. Flippo, A. Krebs, and I. Marsic. Proceedings of the 5th International Conference on Multimodal Interfaces (ICMI '03), Vancouver, Canada, page 109-116. (2003)
P. Lobo, T. Romão, A. Dias, and J. Danado. Ambient Intelligence: European Conference, AmI 2009, Salzburg, Austria, volume 5859 of Lecture Notes in Computer Science, Springer, Berlin, (2009)
T. Pederson, C. Ardito, P. Bottoni, and M. Costabile. Advances in Conceptual Modeling -- Challenges and Opportunities: ER 2008 Workshops CMLSA, ECDM, FP-UML, M2AS, RIGiM, SeCoGIS, WISM, Barcelona, Spain, volume 5232 of Lecture Notes in Computer Science, (2008)