Abdulkareem RM. Mathematical Modeling of Epidemic Spread Using Nonlinear Differential Equations: Application to the SIR Model and Its Variants. UTJ [Internet]. 2025 Sep. 30 [cited 2025 Oct. 3];20(3):133-51. Available from: https://www.jutq.utq.edu.iq/index.php/main/article/view/421