“Analytical Solution of Initial Value Problem for Ordinary Differential Equation With Singular Perturbation and Piecewise Constant Argument”. 2024. ҚазҰУ Хабаршысы. Математика, механика, информатика сериясы 122 (2): 3-13. https://doi.org/10.26577/JMMCS2024-122-02-b1.