[1] INSA Rouen, Lab Math, F-76801 St Etienne, France
[2] Univ Arizona, Dept Math, Tucson, AZ 85704 USA
[3] Skolkovo Innovat Ctr, Skolkovo Inst Sci & Technol, Moscow 143026, Russia
[4] Dept Appl & Computat Math & Stat, Notre Dame, IN 46556 USA
[5] Natl Res Nucl Univ, Moscow Engn Phys Inst, Dept Mol Phys, Moscow 115409, Russia
[6] Natl Res Nucl Univ, Moscow Engn Phys Inst, Dept Solid State Phys & Nanostruct, Moscow 115409, Russia
[7] Moscow Inst Phys & Technol, Dept Gen & Appl Phys, Dolgoprudnyi 141700, Moscow Region, Russia