Affiliation: | 1. Department of Physics and Mathematics, South Ural State Humanitarian-Pedagogical University, Chelyabinsk 454080, Russia;2. Department of Mathematics, Chelyabinsk State University, Chelyabinsk 454080, Russia;3. School of Electrical Engineering and Computer Science, South Ural State University (national research university), Chelyabinsk 454080, Russia;4. Institute of Natural Sciences, South Ural State University (national research university), Chelyabinsk 454080, Russia |