Boltaeva , M. (2024) “THE EXISTENCE OF A SOLUTION OF A NONLOCAL PROBLEM FOR THE WAVE EQUATION OF A STRING”, International Bulletin of Engineering and Technology, 4(8), pp. 9–12. Available at: https://internationalbulletins.com/intjour/index.php/ibet/article/view/1620 (Accessed: 6 April 2026).