1. ASHTON, M., and SMrrH, R. (1953). Brit. J. Ophthal., 37, 577.
2. Elements de gonioscopie;BUSACCA, A.,1945
3. "XVII Conc;BRALEY, A.E.; ALLEN, L.,1955
4. Acta";Canada, U.S.A.;Brit. J. Ophthal; System of Ophthalmology,1954
5. Acta";Canada, U.S.A.;Ibid,1954