1. CAMBELL, A. M. G. & CROSS, G. (1944).-Brit. J. OJhthal., 28, 394.
2. Modern Trends in;CULPIN, M.;Ophthalmology., New York,1940
3. Amet;DERBY, -G. S;Med. Assoc,1930
4. DOGGART, J. H (1944).-Trans. Ophthal. Soc., U.K., 64, 29.
5. Emotion and Bodily Changes;DUNBAR, F.,1938