1. Forschungszentrum Jülich, Institute for Energy and Climate Research - Systems Analysis and Technology Evaluation (IEK-STE), 52428 Jülich, Germany
2. Department of Computer Science, OsloMet - Oslo Metropolitan University, N-0130 Oslo, Norway
3. Queen Mary University of London, School of Mathematical Sciences, Mile End Road, London E1 4NS, UK
4. The Alan Turing Institute, 96 Euston Road, London NW1 2DB, UK
5. Institute for Automation and Applied Informatics, Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany
6. Institute for Theoretical Physics, University of Cologne, 50937 Köln, Germany