1. ALLEN, L., BURIAN, H. M., and BRALEY, A. E. (1955). A.M.A. Arch. Ophthal., 53, 783.
2. BARKAN, 0. (1936). Ibid., 15, 101.
3. BARKAN, 0. (1938). Amer. J. Ophthal., 21, 1099.
4. " Elements de gonioscopie ". Tipographia Rossolilo, Sao Paulo. DUKE-ELDER, S;BUSACCA, A.,1945
5. BUSACCA, A. (1938b). Ibid., p. 32.