1. Adrian, E. D., and Matthews, B. H. C., Brain, 57, 355 (1934).
2. Dawson, G. D., and Walter, W. Grey, J. Neurol. Neurosurg. Psychiat., 7, 119 (1944).
3. Livanov, M. N., J. Physiol. (U.S.S.R.), 28, 172 (1940).
4. Livanov, M. N., and Poliakov, K. L., Bull. Acad. Sci. USSR., 3, 286 (1945).
5. Walter, W. Grey, Electronic Eng., 16, 9 (1943).