A. T. Assanova, “On a Nonlocal Boundary-Value Problem for Systems of Impulsive Hyperbolic Equations”, Ukr. Mat. Zhurn., vol. 65, no. 3, pp. 315–328, Mar. 2013, Accessed: Dec. 05, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/2421