[1]
Boichuk О. A. and S. M. Chuiko, “Periodic solutions of autonomous systems with pulse influence in critical cases”, Ukr. Mat. Zhurn., vol. 47, no. 11, pp. 1478–1484, Nov. 1995, Accessed: Dec. 05, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/5538