1. AMSLER M. and VERREY, F. (1948).-Arch. d'Ofhtal., 8, 150.
2. Analete Romano-Sovietice (Bucharest).-(Abstract Ophthal;B.R.E.C.H.E.R.;Lit,1947
3. CASTROVIEJO, R. (1932).-Amer J. Obhthal., 15, 825.
4. CASTROVIEJO, R. (1941).-Ibid., 24, 1, 139.
5. CASTROVIEJO, R. (1946).-Ibid., 29, 1081.