1. Daos, F.G. &Virtue, R.W. Sympathetic-Block persistence after spinal or epidural analgesia. JAMA183: 285 (1963).
2. Roe, C.F. &Cohn, F.L. Sympathetic blockade during spinal anesthesia. Surg., Gyn. Obs.136: 265 (1973).
3. Goodman, L.S. &Gilman, A. The pharmacological basis of therapeutics, 5th edition, New York, Macmillan, pp. 395 & 396 (1975).
4. Goodman, L.S. &Gilman, A. The pharmacological basis of therapeutics, 5th edition, New York, Macmillan, p. 408 (1975).
5. Ziegler, M.G., Lake, C.R., &Kopin, I.J. Deficient sympathetic nervous response in familial dysautonomia. New Engl. J. Med.294: 630 (1976).