A Semi-Analytical Study on SEIR Model with Vaccinated Effects. Journal of Nonlinear Modeling and Analysis, [S. l.], v. 8, n. 2, p. 338–367, 2026. DOI: 10.12150/jnma.2026.338. Disponível em: https://global-sci.com/jnma/article/view/23911. Acesso em: 13 apr. 2026.