Anuar, A., Kasenov С., Rakhmet Ш., Baetov К., and Tleulesova А. “Quot”;. Bulletin of Abai KazNPU. Series of Physical and Mathematical Sciences, vol. 82, no. 2, June 2023, pp. 111-8, doi:10.51889/2959-5894.2023.82.2.012.