1. Bagley, C. (1928). Arch. Surg., 17, 18.
2. Bielschowsky, P. (1928). Z. ges. Neurol. Psychiat., 117, 55.
3. Pathology of the Nervous System;Courville, C.B.,1937
4. Mountain View, California, Pacific Press. (1942). Bull. Los Angeles Neurol. Soc., 7, 55.
5. The Normal Encephalogram (p. 87). Lea and Febiger;Davidoff, L.M.; Dyke, C.G.,1937