Invariant manifolds of a certain class of differential systems with an impulsive perturbation. Neliniini Kolyvannya, [S. l.], v. 13, n. 2, p. 240–252, 2010. Disponível em: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/561. Acesso em: 21 jan. 2026.