Nurgabyl D, Bekish U. Asymptotic expansion of the solution of a singularly perturbed boundary value problem with boundary initial jumps. M [Internet]. 2017 Dec. 29 [cited 2025 Jul. 10];88(4):47-55. Available from: https://mts.buketov.edu.kz/index.php/mathematics-vestnik/article/view/178