The Goursat Problem for a Higher-Order Hyperbolic Equation with a Spectral Parameter. Uzbek Mathematical Journal, [S. l.], v. 70, n. 3, p. 79–85, 2026. DOI: 10.29229/uzmj.2026-3-9. Disponível em: https://uzmj.mathinst.uz/index.php/uzmj/article/view/53.. Acesso em: 7 oct. 2026.