1. Gardilčić, A. Graefes Arch.135, 293 (1936).
2. Hosford, G. N. u.A. M. Hicks Ref. Zbl. Ophthalm.33, 595 (1935).
3. Kusunoki Ref. Zbl. Ophthalm.9, 146 (1923).
4. Lipschütz, H. Klin. Mbl. Augenheilk.82, 763 (1923).
5. Löwy, K. Arch. Ohrenheilk.134, 180 (1933).