1. Baruk, H. (1931). Encdphale, 26, 42.
2. Tumors Arising from The Bloodi-Vessels of the Brain;Cushing, H.; Bailey, P.,1928
3. Dandy, W. E. (1928). Arch. Surg. (Chicago), 17, 190.
4. Deutsch, L., and Friedman, J. (1938). Dtsch. Z. Nervenheilk., 146, 199.
5. Dimsdale, H. (1957). Proc. roy. Soc. Med., 50, 85.