W. Czernous, “Generalized solutions of mixed problems for first-order partial functional differential equations”, Ukr. Mat. Zhurn., vol. 58, no. 6, pp. 804–828, Jun. 2006, Accessed: Feb. 16, 2026. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/3497