1. Trans;BLACH, R.K.; DAVIES, E.W.G.;ophthal. Soc. U. K,1967
2. CHIGNELL, A. H., REVIE, I. H. S., and CLEMETT, R. S. (1971) Ibid., 9I, 635
3. COX, M. S., SCHEPENS, C. L., and FREEMAN, H. M. (1966) Arch. Ophthal. (Chicago), 76, 678
4. Mod;CROCK, G.;K,1969
5. Arch;HAGLER, W.S.; NORTH, A.W.;Ophthal. (Chicago),1968