1. Institute of Gravitation and Cosmology, Peoples’ Friendship University of Russia, Miklukho-Maklaya Str., 6, Moscow 117198, Russia
2. School of Education, Lebanese University, Beirut P.O. Box 6573/14, Lebanon
3. Federal Research Center “Computer Science and Control” of the Russian Academy of Sciences, Vavilov Str., 44/2, Moscow 119333, Russia