Weakly perturbed integral Fredholm equations with degenerate kernel in Banach spaces. Neliniini Kolyvannya, [S. l.], v. 20, n. 1, p. 85–97, 2017. Disponível em: https://nosc.imath.kiev.ua/index.php/nosc/article/view/857. Acesso em: 12 apr. 2026.