UTESHOVA, R.; KOKOTOVA, Y. Approximation of a singular boundary value problem for a linear differential equation. Bulletin of the Karaganda University. Mathematics Series, [S. l.], v. 117, n. 1, p. 187–198, 2025. DOI: 10.31489/2025m1/187-198. Disponível em: https://mts.buketov.edu.kz/index.php/mathematics-vestnik/article/view/770. Acesso em: 7 sep. 2025.