On Some SEIRS Epidemic Models. Journal of Nonlinear Modeling and Analysis, [S. l.], v. 5, n. 4, p. 753–762, 2024. DOI: 10.12150/jnma.2023.753. Disponível em: https://global-sci.com/index.php/jnma/article/view/13714. Acesso em: 6 dec. 2025.