Integral manifolds and decomposition of nonlinear singularly perturbed systems with delay. Neliniini Kolyvannya, [S. l.], v. 1, n. 1, p. 139–144, 1998. Disponível em: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/17. Acesso em: 22 jan. 2026.