OKREGLICKI, A. ECG Quiz no. 9. SA Heart Journal, [S. l.], v. 4, n. 4, p. 56, 2017. DOI: 10.24170/4-4-2073. Disponível em: https://www.journals.ac.za/SAHJ/article/view/2073. Acesso em: 8 oct. 2025.