M. Schleipen, and R. Drath. Proceedings of 14th IEEE International Conference on Emerging Technologies and Factory Automation (ETFA 2009), Palma de Mallorca, Spain, page a.1--a.4. (2009)
S. Trewin, G. Zimmermann, and G. Vanderheiden. CUU '03: Proceedings of the 2003 Conference on Universal Usability, Vancouver, Canada, page 77-84. (2003)