S. Trewin, G. Zimmermann, and G. Vanderheiden. CUU '03: Proceedings of the 2003 Conference on Universal Usability, Vancouver, Canada, page 77-84. (2003)
U. Callmeier, A. Eisele, U. Schäfer, and M. Siegel. Proceedings of the 4th International Conference on Language Resources and Evaluation (LREC 2004), Lisbon, Portugal, page 1205-1208. European Language Resources Association (ELRA), (2004)
M. Araki. WMISI '07: Proceedings of the 2007 Workshop on Multimodal Interfaces in Semantic Interaction, Nagoya, Japan, page 58-62. New York, USA, ACM, (2007)