On The Stability for Covid-19 Model. Academic Science Journal, [S. l.], v. 2, n. 1, p. 305–321, 2024. DOI: 10.24237/ASJ.02.01.702B. Disponível em: https://acadscij.uodiyala.edu.iq/index.php/Home/article/view/359. Acesso em: 3 apr. 2025.