1. BERSON, D., ZAUBERMAN, H., LANDAU, L., and BLUMENTHAL, M. (1966) Amer. J. Ophthal., 62, 509
2. ILIFF, C. E. (1944) Ibid., 33, 1523
3. Brit;NESTEROV, A.P.; FEDEROVA, N.V.; BATMANOV, Y.E.;J. Ophthal,1972
4. RIDGWAY, A. E. A., RUBINSTEIN, K., and SMITH, V. H. (1972) Ibid., 56, 5II
5. THYER, H. W., and WILSON, P. (1972) Ibid., 56, 37