1. Laser;Constable,1980
2. The ETDRS and Diabetes 2000;Patz,1991
3. Diabetic retinopathy screening project: special medical development at Exeter, Oxford and Sheffield,1990
4. The diabetic retinopathy study and the early treatment diabetic retinopathy study;Cantrill;International Ophthalmology Clinics,1984
5. Screening for Diabetic Retinopathy in Europe