Attaev А.H. Boundary value problems for a loaded wave equation. Bulletin of the Karaganda University. Mathematics Series, [S. l.], v. 86, n. 2, p. 8–13, 2017. DOI: 10.31489/2017m2/8-13. Disponível em: https://mts.buketov.edu.kz/index.php/mathematics-vestnik/article/view/149. Acesso em: 10 jul. 2025.