KELIAT, D.; HASIBUAN, B.; SIREGAR, A.; HALIM, S. Arrhythmias and Conduction Disturbances in Children at the Department of Child Health, School of Medicine University of North Sumatra/Dr. Pirngadi Hospital Medan. Paediatrica Indonesiana, v. 29, n. 3-4, p. 52-63, 14 maio 2018.