1. Department of Mathematics and Mathematical Modeling, Abai Kazakh National Pedagogical University, 13, Dostyk Ave., Almaty 050010, Kazakhstan
2. Department of Science, Abai Kazakh National Pedagogical University, 13, Dostyk Ave., Almaty 050010, Kazakhstan
3. Institute of Information and Computational Technologies, 28, Shevchenko Str., Almaty 050010, Kazakhstan
4. School of Applied Mathematics, Kazakh-British Technical University, 59, Tole bi Str., Almaty 050005, Kazakhstan
5. Department of Mathematics, Sarsen Amanzholov East Kazakhstan University, 148, Shakarim Ave., Ust-Kamenogorsk 070002, Kazakhstan