1. BAKER, G. S., and GOTTLIEB, C. M. (1959). Proc. Mayo. Clin., 34, 474.
2. BERENBERG, W. (1958). A.M.A. Arch. Ophthal., 60, 965.
3. BERND, W. (1930). Klin. Mbl. Augenheilk., 84, 531.
4. BURNS, R. P., and RHODES, D. J., Jr. (1961). Arch. Ophthal., 65, 517.
5. Meeting of Association of British Neurologists (Edinburgh). DUKE-ELDER, S;Dorr, N.; HARRIS, P.,1952