Madiyono, Bambang, Hanafi Trisnohadi, and Maemunah Affandi. “HIS Bundle Electrocardiogram in Children With Secundum Atrial Defects and Patent Ductus Arteriosus”. Paediatrica Indonesiana 21, no. 1-2 (February 28, 1981): 1-10. Accessed July 4, 2024. https://paediatricaindonesiana.org/index.php/paediatrica-indonesiana/article/view/1174.