Ashyralyev, A., and B. Haso. “Stability of the Time-Dependent Identification Problem for Delay Hyperbolic Equations”. Bulletin of the Karaganda University. Mathematics Series 107, no. 3 (September 30, 2022): 25–34. Accessed July 10, 2025. http://mts.buketov.edu.kz/index.php/mathematics-vestnik/article/view/507.