G. Bangga, T. Lutz, and E. Krämer. 7th Conference on Science of Making Torque from Wind (TORQUE, 1037, page 022025. Bristol, IOP Publishing Ltd, (2018)
T. Bauernhansl, M. Tzempetonidou, T. Rossmeissl, E. Gross, and J. Siegert. Advanced Engineering Education & Training for Manufacturing Innovation : 8th CIRP sponsored Conference on Learning Factories (CLF 2018), 23, page 201-206. Amsterdam, Elsevier, (2018)