Affiliation: | 1.Special Astrophysical Observatory, Russian Academy of Sciences (SAO RAS), Nizhnii Arkhyz, 357147, Karachai-Cherkessian Republic, Russia ;2.Institute of Applied Research, Academy of Sciences of Tatarstan, Kazan, Russia ;3.Kazan (Volga Region) Federal University, ul. Kremlevskaya 18, Kazan, 420000, Russia ; |