Institution: | 1.Kazan Federal University (Volga Region), ul. Kremlevskaya 18, Kazan, 420008, Russia ;2.Special Astrophysical Observatory, Russian Academy of Sciences, 369167, Nizhnii Arkhyz, Karachai-Cherkessian Republic, Russia ;3.Institute of Applied Research, Academy of Sciences of Tatarstan, 420111, Kazan, Russia ; |