Global Structure of Planar Quadratic Semi-Quasi-Homogeneous Polynomial Systems. Journal of Nonlinear Modeling and Analysis, [S. l.], v. 1, n. 4, p. 561–572, 2024. DOI: 10.12150/jnma.2019.561. Disponível em: https://www.global-sci.com/index.php/jnma/article/view/13540. Acesso em: 5 dec. 2025.