The Number of Limit Cycles in a Class of Piecewise Polynomial Systems. Journal of Nonlinear Modeling and Analysis, [S. l.], v. 4, n. 2, p. 352–370, 2024. DOI: 10.12150/jnma.2022.352. Disponível em: https://www.global-sci.com/index.php/jnma/article/view/13644. Acesso em: 5 dec. 2025.