Kurtul, N., Aksoy, H., Pençe, S., Bakan, E. and Baykal, O. (2001) “The alterations of serum nitric oxide levels in diabetic retinopathy”, European Journal of Therapeutics, 12(1), pp. 22–27. doi: 10.58600/eurjther.2001-12-1-1422-arch.