1. Ann. ther;BARRAQUER, J.;Clin. Ophtal,1958
2. Arch;BENSON, W.E.; GRAND, M.G.; OKUN, E.;Ophthal; Amer. J,1975
3. Brit;HYAMS, S.W.; BIALIK, M.; NEUMANN, E.;J7. Ophthal,1975
4. RUBEN, M. (1969) Proc. roy. Soc. Med., 62, 696
5. Trans;SHAPLAND, C.D.;K; Arch,1934