1. Università degli Studi di Padova, Department of Mathematics Tullio Levi-Civita, 35121 Padova, Italy
2. École Polytechnique, Département de Mathématiques Appliqués, Palaiseau, France
3. Eindhoven University of Technology, Department of Mathematics and Computer Science, 5600 MB Eindhoven, The Netherlands
4. Université Paris-Dauphine, Ceremade, PSL Research University, 75016 Paris, France