Y. BAYKAL, A. ERDİL, B. KOÇ, T. ÜNAL, and M. KUTLU, “Relationship Between Serum Sialic Acid Levels and Diabetic Retinopathy and Hypertension in Diabetic Patients”, Eur J Ther, vol. 7, no. 1, 2, pp. 40–47, Jan. 1996.