1. Altmann, A. (1948). Clin. Proc., 7, 32.
2. Belmondo, E. (1889). Riv. sper. Freniat., 15, 266.
3. Nutritional Disorders of the Nervous System;Spillane, J.D.,1947
4. Kahn, E. and Robertson, G. H. (1952). S. Afr. med. J., 26, 671.
5. Lewy, F. H., Spies, T. D. and Aring, C. D. (1940). Amer. J. med. Sci., 199, 840.