1. Trans;CASTROVIEJO, R.;Amer. ophthal. Soc; Amer,1953
2. Amer;Kimpton, London F.R.I.E.D.E.N.W.A.L.D.; s, J.;J. Ophthal,1950
3. VON GR6SZ, s;GAZALA, J.R.;Ibid; Arch,1960
4. Klin;HARMS, C.;Mbl. Augenheilk,1903
5. MCKEOWN, H. S. (1937). Arch. Opthal. (NJ.r.) 18s 347 PAPIERBUCH, D., and KURZ, O. (1960) Israel med. J., I9, 260