Exponential stability of invariant manifold for nonlinear impulsive multifrequency system. Neliniini Kolyvannya, [S. l.], v. 22, n. 2, p. 280–288, 2019. Disponível em: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/950. Acesso em: 6 dec. 2025.