E. Arnold, O. Sawodny, J. Neupert, and K. Schneider. IEEE International Conference on Mechatronics and Automation (ICMA), page 1533--1538. Niagara Falls, Canada, (July 2005)
P. Schlott, and O. Sawodny. IEEE/ASME International Conference on Advanced Intelligent Mechatronics (AIM), page 668--673. Wollongong, Australia, (July 2013)