DOUBELL, A. The ECG Atlas of Cardiac Rhythms. SA Heart Journal, [S. l.], v. 13, n. 2, p. 126–127, 2017. DOI: 10.24170/13-2-1680. Disponível em: https://www.journals.ac.za/SAHJ/article/view/1680. Acesso em: 8 oct. 2025.