1. Amer;ARKIN, w,1964
2. ATTIAH, M. A. H. (1933) Bull. ophthal. Soc. Egypt, 26, 96 and SOBHY BEY, M. (1931) Ibid., 24, 67
3. BEHR, C. (1913) Ibid., n.s. I6, 28I
4. The Treasury of Human Inheritance;BELL, J.,1928
5. BUCHANAN, L. (1903) Trans. ophthal. Soc. U.K.., 23, 267 (1923) Ibid., 43, 352