Weakly nonlinear boundary-value problems for impulsive systems of integro-differential equations. Critical case of the second order. Neliniini Kolyvannya, [S. l.], v. 22, n. 2, p. 147–164, 2019. Disponível em: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/942. Acesso em: 21 jan. 2026.