1. Beckett, H. C.: Trans. Ophthal. Soc. Aust. 13,110–127 (1954); ref.
2. Beckett, H. C.: Zbl. Ophthal. 66, 301 (1955/56).
3. Berens, C, u. C. P. Tolman: Proc. XVI int. Cong. Ophthal. London 1950, 2,1499–1503 (1951).
4. Brav, S. S., u. H. P. Kirber: J. Amer. Med. Ass. 147, 1127–1128 (1951).
5. Carpenter, E. M.: 4. Cong, panamer. Oftal. 3,1906–1910 (1952); ref.