1. Brit;CHATTERJEE, B.M.; SEN, N.N.;J. Ophthal,1960
2. CROMBIE, A. L. (1967) Ibid., 51, 101
3. GOODMAN, E. G., and IVERSON, L. (1946) Amer. J. med. Sci., 2II, 205
4. Orient;GUPTA, S.P.; AGARWAL, P.K.; PRATAB, U.B.;Arch. Ophthal,1970
5. MATHUR, J. s., GUPTA, S. P., NEMA, H. v., and KATIYAR, G. P. (1970) Ibid., 8, I87