Askerov, I. M. “On a Determination of the Boundary Function in the Initial-Boundary Value Problem for the Second Order Hyperbolic Equation”. Bulletin of Taras Shevchenko National University of Kyiv. Physical and Mathematical Sciences, no. 1 (April 26, 2022): 56–60. Accessed March 27, 2025. https://bphm.knu.ua/index.php/bphm/article/view/322.