KADIRKULOV, B.J.; JALILOV, M.A. On a nonlocal problem for a fourth-order mixed-type equation with the Hilfer operator. Bulletin of the Karaganda University. Mathematics Series, [S. l.], v. 104, n. 4, p. 89–102, 2021. DOI: 10.31489/2021m4/89-102. Disponível em: https://mts.buketov.edu.kz/index.php/mathematics-vestnik/article/view/476. Acesso em: 4 sep. 2025.