Stanzhytskyi, O.M., R.E. Uteshova, M. Mukash, and V.V. Mogylova. “Application of the Method of Averaging to Boundary Value Problems for Differential Equations With Non-Fixed Moments of Impulse”. Carpathian Mathematical Publications 14, no. 2 (July 26, 2022): 304–326. Accessed November 22, 2024. https://vps.pnu.edu.ua/index.php/cmp/article/view/5776.