1. Brit;ARCHER, D.B.; DAVIES, M.S.; KANSKI, J.J.;J. Ophthal; Biomicroscopy of the eye,1969
2. Trans;Hoeber, New York B.R.O.W.N.; N.;ophthal. Soc. U. K,1969
3. COLLINS, E. TREACHER (1892) Ibid., I2, 89 (1898) Ibid., I8, 124 (1908) Ophthalmoscope, 69 577, 663
4. System of Ophthalmology;DUKE-ELDER, S.,1964
5. Amer;EHRLICH, L.H.;J. Ophthal,1946