“Asymptotic Behavior of the Solution of the Integral Boundary Value Problem for Singularly Perturbed Integro-Differential Equations”. ҚазҰУ Хабаршысы. Математика, механика, информатика сериясы, vol. 112, no. 4, Dec. 2021, https://doi.org/10.26577/JMMCS.2021.v112.i4.02.