Betancourt M., N. C., C. Almeida, and M. Flores-Calero. “Heart Rate Variability and T Wave Alternans As Risk Stratification Indices for Detecting Sudden Cardiac Death: A Review”. IEEE Latin America Transactions, vol. 20, no. 9, Aug. 2022, pp. 2181-8, https://latamt.ieeer9.org/index.php/transactions/article/view/6488.