Донецк

ZankoAlenaIgorevna Donetsk National University, Universitetskaya st., 24, Donetsk, 83001 all53700@mail.ru

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KaloerovStephenAlekseevich Donetsk National University, Universitetskaya st., 24, Donetsk, 83001 kaloerov@mail.ru

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KurganskyyAlekseyNikolaevich Institute of Applied Mathematics and Mechanics, National Academy of Sciences of Ukraine, Ukraine, 83114, Donetsk, R. Luxemburg st., 74 kurgansk@iamm.su

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