OKREGLICKI, A. ECG Quiz no. 18. SA Heart Journal, [S. l.], v. 7, n. 1, p. 58, 2017. DOI: 10.24170/7-1-1969. Disponível em: https://www.journals.ac.za/SAHJ/article/view/1969. Acesso em: 8 oct. 2025.