C. Reiff, F. Eger, T. Korb, H. Freiberger, and A. Verl. 6th CIRP Global Web Conference - Envisaging the future manufacturing, design, technologies and systems in innovation era (CIRPe 2018), 78, page 243-248. Amsterdam, Elsevier, (2018)
D. Antakyali, B. Kuch, V. Preyl, and H. Steinmetz. Proceedings of the WEF Nutrient Recovery and Management Symposium, page 575-582. Water Environment Federation, (2011)