1. Renewables, UL International GmbH, 26122 Oldenburg, Germany
2. Institute of Flight Guidance, Technical University of Braunschweig, 38106 Braunschweig, Germany
3. ForWind, Institute of Physics, Carl von Ossietzky University Oldenburg, 26129 Oldenburg, Germany
4. UL International, Richmond, BC V6V 2V4, Canada