[1]
A. T. Assanova and D. S. Dzhumabaev, “Periodic solutions of systems of hyperbolic equations bounded on a plane”, Ukr. Mat. Zhurn., vol. 56, no. 4, pp. 562–572, Apr. 2004, Accessed: Feb. 16, 2026. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/3777