A Mathematical Framework for Modeling the Spread of HIV-disease within two Different Age Classes . European Journal of Pure and Applied Mathematics, Maryland, USA, v. 16, n. 1, p. 207–232, 2023. DOI: 10.29020/nybg.ejpam.v16i1.4550. Disponível em: https://www.ejpam.com/index.php/ejpam/article/view/4550. Acesso em: 11 apr. 2025.