GOLETS, V. L. On the Problem of Disturbance of Stable Invariant Tore of the Dynamic System . Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 23, n. 1, p. 130–137, 1970. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/8495. Acesso em: 11 apr. 2025.