Pinos Vásquez, Javier, et al. “Early Repolarization, Fragmented QRS and Tpeak-Tend Interval As Electrocardiographic Markers in Patients With Idiopathic Ventricular Arrhythmias: A Brief Review”. JOURNAL OF CARDIAC ARRHYTHMIAS, vol. 33, no. 3, Nov. 2020, pp. 142-6, https://www.jca.org.br/jca/article/view/3394.