Alarcón-Paredes, D., Alonso-Silverio, G., Guzmán-Guzmán, I.P., Ventura-Molina, E. and Alarcón-Paredes, A. 2026. Progressive Transfer Learning in Hybrid CNN-Transformer Architectures for Robust Diabetic Retinopathy Grading. International Journal of Combinatorial Optimization Problems and Informatics. 18, 1 (Sep. 2026), 332–353. DOI:https://doi.org/10.61467/2007.1558.2027.v18i1.1532.