Koshanov B, Koshanova G, Azimkhan G, Segizbayeva R. SOLVABILITY OF BOUNDARY VALUE PROBLEMS WITH NON-LOCAL CONDITIONS FOR MULTIDIMENSIONAL HYPERBOLIC EQUATIONS. PMS [Интернет]. 7 апрель 2020 г. [цитируется по 13 декабрь 2025 г.];(2):103-11. доступно на: http://89.250.84.46/physics-mathematics/article/view/412