1. Ascher, Klin. Mbl. Augenheilk.75, 771 (1925).
2. Axenfeld, Wiedersheim undKüpferle, Klin. Mbl. Augenheilk.44, 61 (1924)
3. 40. Vers. d. Dtsch. ophth. Ges., Heidelberg1916.
4. Birch-Hirschfeld, Graefes Arch.50, 166 (1900);59 (2), 229 (1904)
5. , Klin. Mbl. Augenheilk.46 (2), 129 (1909)