1. Carrier GO, Jackson CV, Owen MP (1979) Influence of age on norepinephrine-induced vascular contractions as a function of extracellular calcium. Res Commun Chem Pathol Pharmacol 26:433?446
2. Cohen ML, Berkowitz BA (1974) Age-related changes in vascular responsiveness to cyclic nucleotide and contractile agonists. J Pharmacol Exp Ther 191:147?155
3. Cohen MI, Berkowitz BA (1976) Vascular contraction effect of age and extracellular calcium. Blood Vessels 13:139?154
4. Docherty JR (1985) Altered cardiovascular responsiveness in the aged rat. Br J Pharmacol 8:627P
5. Docherty JR, O'Mally K (1983) An examination of age-related changes in pre- and postsynaptic ?-adrenoceptors in the rat isolated vas deferens. Eur J Pharmacol 95:171?176