RT Journal Article SR Electronic T1 Electrophysiological effects of norepinephrine on slow responses induced in isolated canine cardiac Purkinje fibers by reduced extracellular pH. JF Journal of Pharmacology and Experimental Therapeutics JO J Pharmacol Exp Ther FD American Society for Pharmacology and Experimental Therapeutics SP 94 OP 100 VO 214 IS 1 A1 L D Davis A1 P R Helmer YR 1980 UL http://jpet.aspetjournals.org/content/214/1/94.abstract AB