MILLAR, R. S. ECG Quiz no. 33. SA Heart Journal, [S. l.], v. 11, n. 1, p. 32, 2017. DOI: 10.24170/11-1-1771. Disponível em: https://www.journals.ac.za/SAHJ/article/view/1771. Acesso em: 8 oct. 2025.