Bifurcation of Limit Cycles of a Perturbed Pendulum Equation. Journal of Nonlinear Modeling and Analysis, [S. l.], v. 6, n. 2, p. 371–391, 2024. DOI: 10.12150/jnma.2024.371. Disponível em: https://global-sci.com/index.php/jnma/article/view/13743. Acesso em: 6 dec. 2025.