1. (i 969) Brit;BINKHORST, C.D.;K; Amer,1959
2. FOLEY, J. (1954) Brit. orthopt. J., II, 3 GERHARD, j. P., and BRONNER, A. (1965) Bull. Soc. Ophtal. Fr., 65, 633
3. GIRARD, L. J., FRIEDMAN, B., MOORE, C. D., BLAU, R. J., BINKHORST, C. D., and GOBIN, M. H. (1962)
4. Ophthalmic Optician, IO, 56 MAURER, Y;Arch;Ophthal. (Chicago); Brit. orthopt,1970
5. RUBEN, C. M. (1962) Ibid., 19, 39