OKREGLICKI, A. ECG Quiz no. 24. SA Heart Journal, [S. l.], v. 8, n. 3, p. 188–189, 2017. DOI: 10.24170/8-3-1900. Disponível em: https://www.journals.ac.za/SAHJ/article/view/1900. Acesso em: 8 oct. 2025.