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2. ANDREWS, C. H., and CARMICHAEL, E. A. (1930) Lancet, I, 857
3. System of Ophthalmology;DUKE-ELDER, S.,1965
4. Arch;Kimpton, London G.U.N.D.E.R.S.E.N.; T.;Ophthal. (Chicago),1936
5. HOWARD, G. M., and KAUFMAN, H. E. (1962) Ibid., 67, 373