A. Raza, S. Musa, A. S. Khalid, M. M. Alam, M. M. Su’ud, and F. Noor, “Multiclass Diabetic Retinopathy: Hybrid Metaheuristic Particle Swarm Optimization and Classification for Severity Grading and Feature Extraction”, Eng. Technol. Appl. Sci. Res., vol. 15, no. 6, pp. 30317–30323, Dec. 2025.