1. BARRAQUER, J. (1970) Trans. ophthal. Soc. U.K., 90, 73I (in discussion of Dallas)
2. io6 British;Journal of Ophthalmology
3. Trans;BINKHORST, C.D.;Amer. Acad. Ophthal. Otolaryng; Rapport Annuel,1973
4. Proc. roy. Soc. Med., 63, 310 -(972) Personal communication GEHRING, J. R. (1968) Arch. Ophthal. (Chicago), 8o, 626
5. GIRARD, L. J., FRIEDMAN, B., MOORE, C. D., BLAU, R. I., BINKHORST, C. D., and GOBIN, M. N. (1962) Ibid., 68, 762