Eshanova С.А., and Muratbekova М.А. “Quot”;. Bulletin of Abai KazNPU. Series of Physical and mathematical sciences 76, no. 4 (December 28, 2021): 7–14. Accessed April 6, 2025. https://bulletin-phmath.kaznpu.kz/index.php/ped/article/view/377.