Nurakhmetova М., and Nurakhmetov Д. “Quot”;. Bulletin of Abai KazNPU. Series of Physical and Mathematical sciences 88, no. 4 (December 27, 2024): 106–116. Accessed September 15, 2026. https://bulletin-phmath.kaznpu.kz/index.php/phmath/article/view/2232.