1. Axenfeld, Lubarsch-Ostertag: Ergebnisse3 (1896).
2. Fuchs, Graefes Arch.61, 365 (1905).
3. Gilbert, Graefes Arch.77, 304 (1910).
4. Guillery, Klin. Mbl. Augenheilk.49, Nr 2, 41 (1911)
5. Guillery, Arch. Augenheilk.68, 242 (1911);72, 99 (1912);74, 132 (1913);76, 226 (1914);78, 11 (1915);94, 143 (1924);97, 141 (1926);99, 63 (1928);102, 353 (1929).