1. Amer. j;ADLER, F.H.;Ophthal,1937
2. Arch;CACCAMISE, W.;Ibid; Dissertation, Bonn, quoted by Duke-Elder (i 964,1954
3. Arch;CABANAS, D.E.L.R.I.O.; L, J.;Soc. Oftal. hisp.-amer; System of Ophthalmology,1964
4. Amer;Kimpton, London E.R.N.Y.E.I.; S.;J. Ophthal,1964
5. EWALD, R. A. (1967) Ibid., 63, 763