OKREGLICKI, A. Answer to ECG Quiz no. 6. SA Heart Journal, [S. l.], v. 4, n. 1, p. 42–43, 2017. DOI: 10.24170/4-1-2110. Disponível em: https://www.journals.ac.za/SAHJ/article/view/2110. Acesso em: 8 oct. 2025.