2021. Asymptotic behavior of the solution of the integral boundary value problem for singularly perturbed integro-differential equations. ҚазҰУ Хабаршысы. Математика, механика, информатика сериясы. 112, 4 (Dec. 2021). DOI:https://doi.org/10.26577/JMMCS.2021.v112.i4.02.