MILLAR, R. S. Answer to ECG Quiz 34. SA Heart Journal, [S. l.], v. 11, n. 2, p. 90–91, 2017. DOI: 10.24170/11-2-1763. Disponível em: https://www.journals.ac.za/SAHJ/article/view/1763. Acesso em: 8 oct. 2025.