1. Arch;BLOCH, F.J.;Ophthal. (Chicago),1948
2. (I 926) "Contributions to Ophthalmic Science";DAVIS, F.A.;Ibid,1939
3. Arch;GOLDSMITH, J.;Ophthal. (Chicago),1949
4. Confin;GOLDSTEIN, I.; WEXLER, D.;Ibid,1930
5. Amer;SARAN, N.; WINTER, F.C.;J. Ophthal; Brit,1967