Dauylbayev, M., Aviltay, N., & Kadirbekov, B. (2020). Asymptotic estimates of the solution of the boundary value problem for singularly perturbed integro-differential equations. Journal of Mathematics, Mechanics and Computer Science, 106(2), 39–49. https://doi.org/10.26577/JMMCS.2020.v106.i2.04