LAKUSTA, L. M.; PETRYSHYN, R. I.; SAMOILENKO, A. M. Averaging of Boundary-Value Problems with Parameters for Multifrequency Impulsive Systems. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 54, n. 9, p. 1237–1249, 2002. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4162. Acesso em: 5 dec. 2025.