Greenspan, K The relation of contractile enhancement to action potential change in canine myocardium. [electronic resource] - Circulation research Mar 1967 - 311-20 p. digital Publication Type: Journal Article ISSN: 0009-7330 Standard No.: 10.1161/01.res.20.3.311 doi Subjects--Topical Terms: Action PotentialsAnimalsCardiac Complexes, PrematureDogsElectrophysiologyHeart--physiologyMuscle ContractionMyocardiumPapillary Muscles