OKELO, N.B. Stability analysis of COVID-19 Model under certain constraints. International Journal of Modern Computation, Information and Communication Technology, [S. l.], v. 4, n. 5 & 6, p. 18–24, 2021. DOI: 10.65000/1vsghv58. Disponível em: https://gjpublications.com/index.php/IJMCICT/article/view/64. Acesso em: 22 oct. 2025.