Bekbolat, B., and N. Tokmagambetov. “Well-Posedness Results for the Wave Equation Generated by the Bessel Operator”. Bulletin of the Karaganda University. Mathematics Series 101, no. 1 (March 30, 2021): 11–16. Accessed July 10, 2025. http://mts.buketov.edu.kz/index.php/mathematics-vestnik/article/view/409.