PARASYUK, I. O.; REPETA, B. V.; SAMOILENKO, A. M. Dynamical Bifurcation of Multifrequency Oscillations in a Fast-Slow System. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 67, n. 7, p. 890–915, 2015. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2032. Acesso em: 5 dec. 2025.