1. Baker, R. D. (1947). Arch. Path., Chicago, 44, 459.
2. Cawlev, E. P. (1947). Arch. intern. Med., 80, 423.
3. Pathology of the central nervous system;Courville, C.B.,1945
4. Courville, C. B., and Adelstein, L. J. (1930). Arch. Surg., Chicago, 21, 801.
5. Dyke, C. G., Wolf, A., Cowen, D., Paige, B. H., and Caffey, J. (1942). Amer. J. Roentgenol., 47, 830.