MIDODASHVILI, B.; KHARIBEGASHVILI, S. On the existence, uniqueness, and nonexistence of solutions of one boundary-value problem for a semilinear hyperbolic equation. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 71, n. 8, p. 1123–1132, 2019. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/1503. Acesso em: 5 dec. 2025.