1. Beetham, W.P.: Diabetic retinopathy in pregnancy. Trans. Am. Ophthalmol. Soc. 48, 205?216 (1950)
2. Oakley, N.W., Hill, D.W., Joplin, G.F., Kohner, E.M., Fraser, T.R.: Diabetic retinopathy. I. The assessment of severity and progress by comparison with a set of standard fundus photographs. Diabetologia 3, 402?405 (1967)
3. Hamilton, A.M., Kohner, E.M., Bowbyes, J.A.: Photocoagulation for diabetic retinopathy in pregnancy. A report of two cases. Trans. Ophthalmol. Soc. U. K. 93, 571?580 (1973)
4. Caird, F.I., Pirie, A., Ramsell, T.G.: The natural history of diabetic retinopathy. In: Diabetes and the Eyes, pp. 72?100. Oxford and Edinburgh: Blackwell Scientific Publications 1969
5. Lawrence, R.D.: Acute retinopathy without hyperpiesis in diabetic pregnancy. Br. J. Ophthalmol. 32, 461?465 (1948)