Suwita, C. S., S. A. Nasution, M. Muhadi, and J. Kurniawan. “Effects of Extracardiac Factors in Signal-Averaged Electrocardiography-Measured Late Potentials from Early Anterior Myocardial Infarction in Intensive Cardiac Care Unit”. Acta Medica Indonesiana, vol. 52, no. 2, Aug. 2020, p. 131, https://actamedindones.org/index.php/ijim/article/view/1364.