AKHMETOV , M. U.; PERESTYUK , N. A. Periodic solutions of quasi-linear impulse systems in a critical case. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 43, n. 3, 2025. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/9608. Acesso em: 6 dec. 2025.