1. Randall, L. O., in Physiological Pharmacology (edit. by Root, W. S., and Hofmann, F. G.), 1, 313 (Academic Press, New York, 1963).
2. Lim, R. K. S., Ann. Rev. Physiol., 32, 269 (1970).
3. Collier, H. O. J., Adv. Pharmacol. Chemotherapy, 7, 333 (1969).
4. Woodbury, D. M., in The Pharmacological Basis of Therapeutics (edit. by Goodman, L. S., and Gilman, A.), 312 (Macmillan, London, 1965).
5. Levitan, H., Tauc, L., & Segundo, J. P., J. Gen. Physiol., 55, 484 (1970).