Subramani, SMammen, P2001-10-092009-06-012001-10-092009-06-012001-10-09Subramani S, Mammen P. Extra systoles in the frog heart. Indian Journal of Physiology and Pharmacology. 2001 Oct; 45(4): 511-3http://imsear.searo.who.int/handle/123456789/106354engAnimalsCardiac Complexes, Premature --veterinaryRanidae --physiologyExtra systoles in the frog heart.Letter