OKREGLICKI, A. Answer to ECG Quiz no. 12. SA Heart Journal, [S. l.], v. 5, n. 3, p. 134–135, 2017. DOI: 10.24170/5-3-2042. Disponível em: https://www.journals.ac.za/SAHJ/article/view/2042. Acesso em: 8 oct. 2025.