STANZHYTSKYI, O.N.; ASSANOVA, A.T.; MUKASH, M.A. Averaging method and two-sided bounded solutions on the axis of systems with impulsive effects at non-fixed times. Bulletin of the Karaganda University. Mathematics Series, [S. l.], v. 104, n. 4, p. 142–150, 2021. DOI: 10.31489/2021m4/142-150. Disponível em: https://mts.buketov.edu.kz/index.php/mathematics-vestnik/article/view/492. Acesso em: 9 jul. 2025.