A Note on the Bendixson-Dulac Theorem for Refracted Systems with Multiple Zones. Journal of Nonlinear Modeling and Analysis, [S. l.], v. 3, n. 2, p. 275–281, 2024. DOI: 10.12150/jnma.2021.275. Disponível em: https://global-sci.com/index.php/jnma/article/view/13598. Acesso em: 6 dec. 2025.