Raza, A., 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”. Engineering, Technology & Applied Science Research, vol. 15, no. 6, Dec. 2025, pp. 30317-23, doi:10.48084/etasr.11147.