1. DE ANDRADE, LoPEs (1930). Ann. Oculist., Paris, 167, 1027.
2. Arq. portug;ANDRADE, D.E.; LoPEs,1949
3. BUSACCA, A. (1937). Arch. Ophthal., Chicago, 17, 117.
4. CUtNOD, A., and NATAF, R. (1930). Rev. int. Trachome, 7, 13.
5. CUtNOD, A., and NATAF, R. (1937). British Journal of Ophthalmology, 21, 309.