1. K. Graefe, H. Bonisch, Handbook of Experimental Pharmacology, 90/1, Springer-Verlag, Berlin (1988), pp. 191–245.
2. H. Bonisch and U. Trendelenburg, Handbook of Experimental Pharmacology, Springer-Verlag, New York (1988), pp. 247–277.
3. A. Burgen and L. Iversen, Br. J. Pharmacol., 25, 34–49 (1965).
4. J. Coyle and S. Snyder, J. Pharmacol. Exp. Ther., 170(2), 221-231 (1969).
5. J. Holmes and C. Rutledge, Biochem. Pharmacol., 25(4), 447–451 (1976).