1. M. Nickerson, inThe Pharmacological Basis of Therapeutics, 3rd edn (Eds.L. S. Goodman andA. Gilman; The MacMillan Company, New York 1965), p. 720.
2. B. Ablad, Acta Pharmac. Tox.20, Suppl. No. 1, 1 (1963).
3. G. Glick andE. Braunwald, Circulation Res.16, 363 (1965).
4. H. Brunner, P. R. Hedwall andM. Meier, Br. J. Pharmac.60, 123 (1967).
5. D. Dunlop andR. G. Shanks, Br. J. Pharmac.32, 201 (1968).