1. Bastai undBusacca, Münch. med. Wochenschr. 1924, Nr. 31, S. 1056.
2. Doerr, Zentralbl. f. d. ges. Ophth.14, 705–768 u. 833–896. 1925.
3. Friedenwald, Arch. of ophth.52, 105. 1922.
4. Grüter, Münch. med. Wochenschr. 1924, Nr. 31, S. 1058.
5. Grüter, Arch. f. Augenheilk.95, 180. 1925.