1. von Graefes Arch;BETTELHEIM, H.;klin. exp. Ophthal,1967
2. Amer;BLUMENTHAL, M.; GITrER, K.A.; BEST, M.; GALIN, M.A.;J. Ophthal,1970
3. CALHOUN, F. P. (1929) Ibid., I2, 265
4. Brit;DIENSTBIER, E.; BALiK, j; KAFKA, H.;J. Ophthal,1950
5. Amer;DRANCE, S.M.;K,1962