MURATBEKOV, M.B.; MURATBEKOV, M.M. Smoothness and approximative properties of solutions of the singular nonlinear Sturm-Liouville equation. Bulletin of the Karaganda University. Mathematics Series, [S. l.], v. 100, n. 4, p. 113–124, 2020. DOI: 10.31489/2020m4/113-124. Disponível em: http://mts.buketov.edu.kz/index.php/mathematics-vestnik/article/view/391. Acesso em: 4 sep. 2025.