1. 1. JM. Walton, Brain's diseases of the nervous system., 8th edn . Oxford: Oxford University Press1977 ; 672 -4 .
2. 2. C. Oakley, DJ Weather-all, JGG Ledingham, and DA Warrell, Oxford textbook of medicine., 13 . 195 .
3. 4. LB. Kadis, J Katz, J Benumof, and LB Kadis, Anesthesia and uncommon diseases , 2nd edn . Philadelphia: W.B. SaundersAND CO1981 . 492 -3 .
4. 5. RJ Defalque, VS. Musunuru, RK Stoelting, and SF Dierwrf, Anesthesia and coexisting disease. Churchill Livingstone, 277 .