A. O. Olijnyk, “On a solution of a boundary-value problem for a hyperbolic equation on a disk with random initial conditions”, Ukr. Mat. Zhurn., vol. 52, no. 3, pp. 409–415, Mar. 2000, Accessed: Dec. 05, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/4431