1. Åblad, B., Brogård, M., Ek, L.: Pharmacological properties of H56/28 ? a ?-adrenergic receptor antagonist. Acta Pharmacol. Toxicol. (Kbh.) 25, Suppl. 2, 9?40 (1967)
2. Ahlquist, R. P.: A study of the adrenotropic receptors. Am. J. Physiol. 153, 586?599 (1948)
3. Arunlakshana, O., Schild, H. O.: Some quantitative uses of drug antagonists. Br. J. Pharmacol. 14, 48?58 (1959)
4. Barrett, A. M., Carter, J.: Comparative chronotropic activity of ?-adrenoceptive antagonists. Br. J. Pharmacol. 40, 373?381 (1970)
5. Bilski, A. J., Wale, J. L.: Two types of intrinsic sympathomimetic activity with ?-adrenoceptor blocking drugs. Br. J. Pharmacol. 56, 362P (1976)