MILLAR, R. S.; CHIN, A. ECG Quiz 57 Question. SA Heart Journal, [S. l.], v. 17, n. 1, p. 90, 2020. DOI: 10.24170/17-1-4033. Disponível em: https://www.journals.ac.za/SAHJ/article/view/4033. Acesso em: 8 oct. 2025.