1. Arch;ABRAHAMS, I.; i. w;Ophthal. (Chicago),1966
2. Arch;AUBRY, M.;Ophtal. (Paris),1965
3. BOLCS, S. (I 967) Szemdszet, 104, 3I I 6. BROWN, 0. L., LONGACRE, J. J., DESTEFANO, G. A., WOOD, R. w., and KAHL, J. B. (1965)
4. BROWNING, C. W. (1967) Amer.
5. and WALKER, R. V. (1965) Ibid., 6o, 684