BALANOV, Z.; HOOTON, E.; MURZA, A. Periodic solutions of vdP and vdP-like systems on 3-Tori. Topological Methods in Nonlinear Analysis, [S. l.], v. 50, n. 1, p. 253–268, 2017. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2017.023. Acesso em: 19 apr. 2024.