Improved Contact Tracing SIR Model for Randomly Mixed Populations. Journal of Nonlinear Modeling and Analysis, [S. l.], v. 7, n. 2, p. 666–679, 2025. DOI: 10.12150/jnma.2025.666. Disponível em: https://global-sci.com/index.php/jnma/article/view/13826. Acesso em: 6 dec. 2025.