Shehu Sidi , A. and Mohd, M.H. 2025. Bifurcation Analysis of a Modified SIR-Based COVID-19 Model with Nonlinear Incidence and Recovery Rates. MATEMATIKA. 41, 3 (Nov. 2025), 375–387. DOI:https://doi.org/10.11113/matematika.v41.n3.1703.