Regional Prediction of COVID-19 in the United States Based on the Difference Equation Model. Journal of Nonlinear Modeling and Analysis, [S. l.], v. 3, n. 4, p. 547–559, 2024. DOI: 10.12150/jnma.2021.547. Disponível em: https://global-sci.com/index.php/jnma/article/view/13616. Acesso em: 5 dec. 2025.