1. Burn, R. A., D. A. B. Hopkins, G. Edwards U. G. M. Jones: Brit. J. Ophthal. 39, 333–342 (1955).
2. Fortin,E. P.: Arch. Oftal. B.Aires 16, 316–335 (1941);
3. ref. nach Barkan, O.: Ophthalmology in the War Years, Meyer-Wiener, Chicago, 1 (1946).
4. Howard, H. J.: Amer. J. Ophthal. 18, 461–462 (1935).
5. Leonardi, F.: Boll. Oculist. 35, 889–902 (1956).