Uniqueness, stability analysis and approximate solution of a fractional order COVID-19 Model . Journal of Mathematical Modeling and Fractional Calculus, [S. l.], v. 1, n. 1, p. 1–24, 2024. DOI: 10.48165/jmmfc.2024.1101. Disponível em: https://journals.acspublisher.com/index.php/jmmfc/article/view/19853. Acesso em: 5 apr. 2025.