OKREGLICKI, A. Answer to ECG Quiz no. 8. SA Heart Journal, [S. l.], v. 4, n. 3, p. 46–47, 2017. DOI: 10.24170/4-3-2090. Disponível em: https://www.journals.ac.za/SAHJ/article/view/2090. Acesso em: 8 oct. 2025.