1. Bal6, J. (1928). At-ch. Neurol. Psychiat., Chicago, 19, 242.
2. The Brain in Health and Disease.;Bolton, J.S.,1914
3. The Postnatal Development of the Human Cerebral Cortex;Conel, J.;LeRoy,1939
4. Connolly, C. J. (1940). Amer. J. phys. Anthrop., 26, 113.
5. Filimonoff, I. N. (1929). J. Psychol. Neurol., Lpz., 39, 323.