D. Santha Rao. “A Study of Serum Magnesium Levels in Patients Suffering from Diabetic Retinopathy”. World Journal of Pharmaceutical Sciences, vol. 3, no. 12, Dec. 2015, pp. 2504-6, https://wjpsonline.com/index.php/wjps/article/view/study-serum-magnesium-patients-suffering-diabetic-retinopathy.