MILLAR, R. S. Answer to ECG Quiz no. 29. SA Heart Journal, [S. l.], v. 9, n. 4, p. 284–285, 2017. DOI: 10.24170/9-4-1834. Disponível em: https://www.journals.ac.za/SAHJ/article/view/1834. Acesso em: 8 oct. 2025.