1. D'Amico: Z. Augenheilk. u. Arch. Augenheilk. 16, 488 (1925).
2. Axenfeld, Th.: Graefes Arch. 40, 134 (1879).
3. Baader, E.: Arch. f. Dermat. 149, 261 (1925); 150, 107 (1926).
4. Bäumler: Mbl. Augenheilk. 23, 329 (1885).
5. Beinhauer: Arch. of Dermat. 21, 706 (1930); ref. Zbl. Hautkrkh. 35, 495 (1931).