MURATBEKOV, M.B.; BAYANDIYEV, Ye.N. Existence and smoothness of solutions of a singular differential equation of hyperbolic type. Bulletin of the Karaganda University. Mathematics Series, [S. l.], v. 107, n. 3, p. 98–104, 2022. DOI: 10.31489/2022m3/98-104. Disponível em: http://mts.buketov.edu.kz/index.php/mathematics-vestnik/article/view/524. Acesso em: 10 jul. 2025.