ATAKHAN, N.; NURPEISSOV, K.S.; KONISBAYEVA, K.T. Asymptotic estimations of the solution for a singularly perturbed equation with unbounded boundary conditions. Bulletin of the Karaganda University. Mathematics Series, [S. l.], v. 108, n. 4, p. 20–33, 2022. DOI: 10.31489/2022m4/20-33. Disponível em: https://mts.buketov.edu.kz/index.php/mathematics-vestnik/article/view/521. Acesso em: 2 jul. 2025.