OKREGLICKI, A. Answer to ECG Quiz no. 11. SA Heart Journal, [S. l.], v. 5, n. 2, p. 90–91, 2017. DOI: 10.24170/5-2-2052. Disponível em: https://www.journals.ac.za/SAHJ/article/view/2052. Acesso em: 8 oct. 2025.