1. AUMA Riester GmbH & Co. KG, Aumastrasse 1, 79379 Muellheim, Germany
2. Laboratory for Turbomachinery and Fluid Power, Darmstadt University of Technology, Magdalenenstrasse 4, 64289 Darmstadt, Germany
3. Laboratory for Water and Turbine Machines, University of Ljubljana, Askerceva 6, 1000 Ljubljana, Slovenia