OTAROVA, J.A. A boundary value problem for the fourth-order degenerate equation of the mixed type. Bulletin of the Karaganda University. Mathematics Series, [S. l.], v. 113, n. 1, p. 140–148, 2024. DOI: 10.31489/2024m1/140-148. Disponível em: https://mts.buketov.edu.kz/index.php/mathematics-vestnik/article/view/691. Acesso em: 9 jul. 2025.