1. Fox, C. A., J. Comp. Neurol., 72, 1 (1940).
2. Cajal, S. R., Studies on the Cerebral Cortex (Limbic Structures), translated from the Spanish by Kraft, L. M. (Lloyd-Luke Ltd., London, 1955).
3. Crosby, Elizabeth C., Humphrey, T., and Lauer, E. W., Correlative Anatomy of the Nervous System (The Macmillan Co., New York, 1962).
4. Brockhaus, H., J. Psychol. Neurol. Leipzig, 51, 1 (1942).
5. Gajdusek, D. C., Trans. Roy. Soc. Trop. Med., 57, 151 (1963).