Midodashvili B, Kharibegashvili S. On the existence, uniqueness, and nonexistence of solutions of one boundary-value problem for a semilinear hyperbolic equation. Ukr. Mat. Zhurn. [Internet]. 2019Aug.25 [cited 2024Dec.22];71(8):1123-32. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/1503