C. Locher, R. Minke, and H. Steinmetz. Conference Proceedings of Water & Industry 2011 IWA Specialist Conference Chemical Industries, Valladolid, (2011)
C. Locher, R. Minke, and H. Steinmetz. Conference Proceedings of the 1st International Conference on Anaerobic Digestion of Waste and Wastewater, Anaerobic Digestion Asia 2010, Bangkok, (2010)
N. Otto, S. Platz, T. Fink, and U. Menzel. Conference Proceedings of the IWA 7th Eastern European Young Water Professionals Conference, page 565--572. (2015)