1. Bailliart et Blutel.-Arch. d'Oihtal., Vol. XXX, p. 507, 1913.
2. Butler. Illustrated Guide to Slit-Lamp;Blancke. Dissertation. Giessen. 1905. Blatt. Klin. Monatsbl. f. Augenheilk., Vol;LXXX; Trans,1925
3. Brit;K., Soc U.; Vol;Ji. of Ophthal,1926
4. Recent Advances in Ophthalmology;XII;91 and 148, 1928. Goldsmith. Ophthalmoscope, Vol. V; Arch. of Ophthal., Vol. XXXIX; 85; 1928. Holloway,1928
5. Sequeira. Diseases of the Skin;f. Augenheilk., Zeitschr; LXIX, Vol;Piriis. Arch. d'Obhtal., Vol. XLV,1929