Hyperbolic invariant tori of a fast-slow system exhibiting the dynamical bifurcation of multifrequency oscillations. Neliniini Kolyvannya, [S. l.], v. 19, n. 1, p. 101–121, 2016. Disponível em: https://nosc.imath.kiev.ua/index.php/nosc/article/view/815. Acesso em: 12 apr. 2026.