N.A.S. thanks LAPTH in Annecy-le-Vieux for the hospitality and stimulating scientific atmo-sphere, and CNRS for partial financial support. The work of A.L. has been funded by the Russian Academic Excellence Project 5-100 and by joint NASU-CNRS project F14-2016. The work of S.P. was supported in part by the RFBR grant 16-01-00562-a. N.A.S. was supported by the grants RFBR-15-31-20484-mol-a-ved and RFBR-14-01-00860-a.
Поступила в редакцию: 08.08.2016 Принята в печать: 19.08.2016
Обратная связь: