KAPLUN, Yu. I.; SAMOILENKO, A. M.; SAMOILENKO, V. G. Singularly Perturbed Equations with Impulse Action. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 54, n. 8, p. 1089–1009, 2002. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4149. Acesso em: 6 dec. 2025.