Y. Körber, V. Hahn, M. Moniri, T. Schwartz, and M. Feld. Proceedings of the 13th IEEE International Conference on Intelligent Environments (IE '17), Seoul, South Korea, page 184--187. Los Alamitos, CA, IEEE Computer Society, (2017)
W. Bauer, B. Dworschak, and H. Zaiser. Handbuch Industrie 4.0 Bd.\, 1: Produktion, Springer, Berlin, 2 edition, DOI: 10.1007/978-3-662-45279-0\_36.(2017)