1. The Bacteriology of the Eye;AXENFELD, T.;Balliere, London. BOYD,1908
2. BROWN, A. L. and PUGH, J. (1936).-Arch. OQhthal. N.Y., Vol. XVI, p. 476.
3. BROWNING, C. H. (1943).-Brit. Med. JI., (I), p. 341. CHUkRGINA (1930).-Klin. Monatsbl.f Augenhsilk., Aug. LXXXV, p. 375.
4. BROWNING, C. H. (1931).-Klifi, Monatsbl.1. Augenheilk., Aug. LXXXVII, p. 354. DICKSON. R. M. (1942).-Brit. Jl. Ophthql., Vol. XXVI,,p. 529. DUKE-ELDER, S. (1938).-Text-bookof OphthalmolQgy, Vol. II, Kimpton, London.
5. GINSBERG, S. and KAUFMANN, M. (1913).-Klin. Monatsbl.f. Augenheilk., Aug. LI, p. 804.