D. Sonntag, and M. Möller. Proceedings of IUI '10: 15th International Conference on Intelligent User Interfaces, Hong Kong, China, page 381-384. (2010)
V. Tablan, D. Damljanovic, and K. Bontcheva. The Semantic Web: Research and Applications, 5th European Semantic Web Conference, ESWC 2008, Tenerife, Canary Islands, Spain, volume 5021 of Lecture Notes in Computer Science, Springer, Berlin, (2008)
G. Di Fabbrizio, J. Wilpon, and T. Okken. Proceedings of the 11th International Conference on Multimodal Interfaces and the 6th Workshop on Machine Learning for Multimodal Interfaces (ICMI-MLMI '09), Cambridge, MA, USA, page 71-78. (2009)