Madiyono, B., Trisnohadi, H. and Affandi, M. 1981. HIS bundle electrocardiogram in children with secundum atrial defects and patent ductus arteriosus. Paediatrica Indonesiana. 21, 1-2 (Feb. 1981), 1-10. DOI:https://doi.org/10.14238/pi21.1-2.1981.1-10.