Weakly perturbed impulsive boundary-value problem for integro-differential systems in the resonance case. Neliniini Kolyvannya, [S. l.], v. 25, n. 1, p. 14–24, 2022. Disponível em: https://nosc.imath.kiev.ua/index.php/nosc/article/view/1053. Acesso em: 12 apr. 2026.