1. Department of Computer Science Université Libre de Bruxelles Brussels Belgium
2. Parc scientifique de la Haute Borne Inria Lille ‐ Nord Europe Villeneuve d'Ascq France
3. Department of Mathematics Trier University Trier 54296 Germany
4. Discrete Optimization Friedrich‐Alexander‐Universität Erlangen‐Nürnberg Erlangen 91058 Germany
5. Energie Campus Nürnberg Nürnberg 90429 Germany