1. Department of Applied Mathematics, University of California , Merced, 5200 North Lake Road, Merced, CA 95343 , USA
2. Univ Lyon, INSA Lyon, UJM, UCBL, ECL , CNRS UMR 5208, ICJ, F-69621 , France
3. POEMS, CNRS, Inria, ENSTA Paris, Institut Polytechnique de Paris , 828 Boulevard des Maréchaux, F-91120 Palaiseau, France