T. S. Zverkova and V. A. Plotnikov, “Method of partial averaging in the systems of standard form with discontinuous right-hand sides”, Ukr. Mat. Zhurn., vol. 45, no. 1, pp. 140–142, Jan. 1993, Accessed: Apr. 09, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/5794