AL-HUSSEINY , Hassan Fadhil. Global Stability of an epidemic model with vaccine involving stage structure. Iraqi Journal of Science, [S. l.], v. 57, n. 4C, p. 2922–2931, 2022. Disponível em: https://www.ijs.uobaghdad.edu.iq/index.php/eijs/article/view/6279.. Acesso em: 7 dec. 2025.