ASHYRALYEV, A.; EMHARAB, F. Identification hyperbolic problems with the Neumann boundary condition. Bulletin of the Karaganda University. Mathematics Series, [S. l.], v. 91, n. 3, p. 89–98, 2018. DOI: 10.31489/2018m3/89-98. Disponível em: https://mts.buketov.edu.kz/index.php/mathematics-vestnik/article/view/296. Acesso em: 10 jul. 2025.