OKREGLICKI, A. ECG Quiz no. 23. SA Heart Journal, [S. l.], v. 8, n. 2, p. 132–133, 2017. DOI: 10.24170/8-2-1912. Disponível em: https://www.journals.ac.za/SAHJ/article/view/1912. Acesso em: 8 oct. 2025.