YANG, C.; WANG, Z. On the existence of periodic solutions for Liénard type $\phi$-Laplacian equation. Topological Methods in Nonlinear Analysis, [S. l.], v. 62, n. 1, p. 219–237, 2023. DOI: 10.12775/TMNA.2022.067. Disponível em: https://apcz.umk.pl/TMNA/article/view/46311. Acesso em: 22 jul. 2024.