Weakly perturbed systems of linear integro-dynamic equations on time scales. Neliniini Kolyvannya, [S. l.], v. 24, n. 1, p. 3–16, 2021. Disponível em: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/1011. Acesso em: 8 dec. 2025.