1. Barnett, M., Greenhouse, D. D., Taber, R. I.: A new type of drug enhancement: increased maximum response to cumulative noradrenaline in the isolated rat vas deferens. Brit. J. Pharmacol. 33, 171?176 (1968).
2. Bevan, J. A., Verity, M. A.: Sympathetic nerve free vascular muscle. J. Pharmacol. exp. Ther. 157, 117?124 (1967).
3. Brandão, F., Guimarães, S.: The termination of action of exogenous noradrenaline in the isolated cat spleen tissue. Naunyn-Schmiedebergs Arch. Pharmacol. 275, 119?123 (1972).
4. Brimijoin, S., Pluchino, S., Trendelenburg, U.: On the mechanism of supersensitivity to norepinephrine in the denervated cat spleen. J. Pharmacol. exp. Ther. 175, 503?513 (1970).
5. Davidson, W. J., Innes, I. R.: Dissociation of potentiation of isoprenaline by cocaine from inhibition of uptake in cat spleen. Brit. J. Pharmacol. 39, 175?181 (1970).