1. Institute of Physics of Dagestan Scientific Centre of the Russian Academy of Sciences, 94 M. Yaragskogo str., Makhachkala, Republic of Dagestan, Russia, 367015
2. Dagestan State University 43a M. Gadzhieva str., Makhachkala, Republic of Dagestan, Russia, 367000
3. Joint Institute for High Temperatures of the Russian Academy of Sciences, 13 Izhorskaya str., Moscow, Russia, 125412