Elvira Erkin kizi Shakayeva. 2023. “METHODS OF SETTING AND SOLVING MIXED AND BOUNDARY PROBLEMS FOR HYPERBOLIC TYPE EQUATIONS”. INTERNATIONAL JOURNAL OF SOCIAL SCIENCE & INTERDISCIPLINARY RESEARCH ISSN: 2277-3630 Impact Factor: 8.036 12 (09):34-40. https://gejournal.net/index.php/IJSSIR/article/view/1934.