1. School of Engineering, The Australian National University, Canberra, Australia
2. Institute of Energy Systems, Energy Efficiency and Energy Economics, Technische Universität Dortmund, Dortmund, Germany and Institute of Control Systems, Hamburg University of Technology, Hamburg, Germany
3. Mathematisches Institut, Universität Bayreuth, Bayreuth, Germany
4. New School for Social Research, New York, USA, and University of Bielefeld, Bielefeld, Germany, and International Institute for Applied Systems Analysis, Austria
5. School of Engineering, University of Newcastle, Newcastle, Australia