1. CERMICS, École des Ponts ParisTech, 6-8 Avenue Blaise Pascal, 77455 Marne-la-Vallée, France
2. MATHERIALS Team-project, Inria Paris, 2 Rue Simone Iff, 75012 Paris, France
3. IFP Energies Nouvelles, Rond-Point de l’Echangeur de Solaize, BP 3, 69360 Solaize, France
4. Department of Mathematics and Computer Science, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany
5. Zuse Institute Berlin, Takustraße 7, 14195 Berlin, Germany