Affiliation: | 1. Berbekov Kabardino-Balkarian State University, Nalchik, 360004, Russia 2. Chechen State University, Grozny, 364907, Russia 3. North Caucasus Institute of Mining and Metallurgy, Vladikavkaz, 362021, Russia 4. Complex Science Research Institute, Russian Academy of Sciences, Grozny, 364096, Russia
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