ABDULKAREEM, Rezan Mohammed. Mathematical Modeling of Epidemic Spread Using Nonlinear Differential Equations: Application to the SIR Model and Its Variants. University of Thi-Qar Journal, [S. l.], v. 20, n. 3, p. 133–151, 2025. Disponível em: https://www.jutq.utq.edu.iq/index.php/main/article/view/421. Acesso em: 3 oct. 2025.