Hopf Cyclicity of a Class of Liénard-Type Systems. Journal of Nonlinear Modeling and Analysis, [S. l.], v. 5, n. 4, p. 682–694, 2024. DOI: 10.12150/jnma.2023.682. Disponível em: https://www.global-sci.com/index.php/jnma/article/view/13709. Acesso em: 5 dec. 2025.