On stability of a toroidal manifold for a class of dynamical systems. Neliniini Kolyvannya, [S. l.], v. 19, n. 4, p. 555–563, 2016. Disponível em: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/849. Acesso em: 8 dec. 2025.