1. Arch;BLANTON, F.;Ophthal. (Chicago),1964
2. COLE, J. G., and BYRON, H. M. (1964) Ibid., 71, 35
3. COLLINS, E. TREACHER (1892) Trans. ophthal. Soc. U.K., 12, I80 COX, M. S., SCHEPENS, C. L., and FREEMAN, H. M. (1966) Arch. Ophthal. (Chicago), 76, 678
4. Amer;DARR, J.L.; PASSMORE, J.w;J. Ophthal,1967
5. Acta ophthal;GREGERSEN, E.;(Kbh.); Amer,1962