OKREGLICKI, A. Answer to ECG Quiz no. 20. SA Heart Journal, [S. l.], v. 7, n. 3, p. 182–185, 2017. DOI: 10.24170/7-3-1948. Disponível em: https://www.journals.ac.za/SAHJ/article/view/1948. Acesso em: 8 oct. 2025.