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I.V. Chepkasov - Ph.D. (Phys.-Math.), Khakas State University, Abakan. E-mail: ilya_chepkasov@mail.ru
I.V. Chepkasov - Ph.D. (Phys.-Math.), Khakas State University, Abakan. E-mail: ilya_chepkasov@mail.ru