ISAACSON, A Variability of twitch potentiation in frog skeletal muscle. [electronic resource] - Nature Oct 1962 - 381-2 p. digital Publication Type: Journal Article ISSN: 0028-0836 Standard No.: 10.1038/196381a0 doi Subjects--Topical Terms: AnimalsAnuraMuscle, SkeletalMusclesZinc