Mathematical Analysis of the Dynamics of COVID-19 in the Face of Vaccination in African Countries. Contemporary Mathematics , [S. l.], v. 5, n. 3, p. 3689–3739, 2024. DOI: 10.37256/cm.5320243404. Disponível em: https://ojs353.mebyme.cn/index.php/CM/article/view/3404. Acesso em: 24 dec. 2025.