Haj, B., and S. Popa. “Retinopathy and Chronic Kidney Disease in Type 2 Diabetes Mellitus”. Romanian Journal of Diabetes Nutrition and Metabolic Diseases, Vol. 28, no. 2, June 2021, pp. 160-9, http://www.rjdnmd.org/index.php/RJDNMD/article/view/978.