Stanzhytskyi O, Assanova A, Mukash M. Averaging method and two-sided bounded solutions on the axis of systems with impulsive effects at non-fixed times. M [Internet]. 2021 Dec. 30 [cited 2025 Jul. 9];104(4):142-50. Available from: https://mts.buketov.edu.kz/index.php/mathematics-vestnik/article/view/492