SLYUSARCHUK, V. V. Conditions for Instability of an Invariant Toroidal Manifold of a Discrete Dynamical System in a Banach Space. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 53, n. 4, p. 572–576, 2001. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4280. Acesso em: 14 apr. 2025.