J. Friedrich, H. Hartmann, A. Verl, and A. Lechler. Proceedings of the 24th International Conference on Flexible Automation & Intelligent Manufacturing, University of Texas at San Antonio, (2014)
M. Birkhold, C. Friedrich, and A. Lechler. IFAC-PapersOnLine, 48 (17):
195 - 200(2015)4th \IFAC\ Workshop on Mining, Mineral and Metal Processing \MMM\ 2015Oulu, Finland, 25–27 August 2015.
J. Friedrich, and A. Verl. Proceedings of the International Conference on Advanced Manufacturing Engineering and Technologies NEWTECH 2013, page 117-126. (2013)