MILLAR, R. S.; CHIN, A. ECG Quiz 53: Answer. SA Heart Journal, [S. l.], v. 16, n. 1, p. 52–54, 2019. DOI: 10.24170/16-1-3415. Disponível em: https://www.journals.ac.za/SAHJ/article/view/3415. Acesso em: 8 oct. 2025.