Kmit IY. On a nonlocal problem for a quasilinear first-order hyperbolic system with two independent variables. Ukr. Mat. Zhurn. [Internet]. 1993 Sep. 25 [cited 2025 Dec. 5];45(9):1307–1311. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/5934