1. Epidemiological and Vital Statistics Report. 6:No. 1 (Jan.) 1953.
2. The occurrence of blindness in Norway;Holst;Am. J. Ophth.,1952
3. Lancaster, W.B, and Foote, F.: The battle against blindness. J.A.M.A., 145:26 (Jan.) 1951.
4. Skúlason, H.: Um glaukomblindu. Reykjavík, 1933.