1. Cambustion Ltd., Cambridge, England CB1 8DH, United Kingdom
2. Rolls–Royce, plc., Derby, England DE24 8BJ, United Kingdom
3. Swiss Federal Office of Civil Aviation, CH-3003 Bern, Switzerland
4. Department of Integrated Engineering, Minnesota State University, Mankato, Minnesota 56001
5. Department of Engineering, University of Cambridge, Cambridge, England CB2 1PZ, United Kingdom
6. ETH Zürich, Institute of Environmental Engineering, CH-8093 Zürich, Switzerland