“Analytical Solution of Initial Value Problem for Ordinary Differential Equation With Singular Perturbation and Piecewise Constant Argument”. ҚазҰУ Хабаршысы. Математика, механика, информатика сериясы 122, no. 2 (June 30, 2024): 3–13. Accessed July 14, 2026. https://bm.kaznu.kz/index.php/kaznu/article/view/1303.