1. Anderson, G. W. (1952). J. Pediat., 40, 340.
2. Bakwin, H. (1949). Ibid., 34, 371.
3. Pediatric Clinics of North America;Dietrich, H.F.,1954
4. Neurosurgery of Infancy and Childhood;Ingraham, F.D.; Matson, D.D.,1954
5. Langford, W. S., Gilder, R. Jr., Wilking, V. N., Genn, M. M. and Sherrill, H. H. (1953). Pediatrics, 11, 405.