[1] Inst Math Jussieu Paris Rive Gauche, CNRS UMR 7586, Batiment Sophie Germain,Case 7021, F-75205 Paris 13, France
[2] IMPA, Estr Dona Castarino 110, BR-22460320 Rio De Janeiro, Brazil
[3] Inst Math Marseille, 39 Rue F Joliot Curie, F-13453 Marseille 20, France
[4] Natl Res Univ Higher Sch Econ, Fac Math, Vavilova St 7, Moscow 112312, Russia