OKREGLICKI, A. Answer to ECG Quiz no. 17. SA Heart Journal, [S. l.], v. 6, n. 4, p. 258–9, 2017. DOI: 10.24170/6-4-1978. Disponível em: https://www.journals.ac.za/SAHJ/article/view/1978. Acesso em: 8 oct. 2025.