X. Li, T. Schlegel, M. Rotard, and T. Ertl. Proceedings of the Intelligent Production Machines and Systems - 2nd I*PROMS Virtual International Conference 2006, (2006)
A. Hub, S. Kombrink, K. Bosse, and T. Ertl. Proceedings of the California State University, Northridge Center on Disabilities' 22nd Annual International Technology and Persons with Disabilities Conference (CSUN 2007); March 19-24; Los Angeles, CA, USA, (2007)
