OKREGLICKI, A. Answer to ECG Quiz no. 26. SA Heart Journal, [S. l.], v. 9, n. 1, p. 48–50, 2017. DOI: 10.24170/9-1-1877. Disponível em: https://www.journals.ac.za/SAHJ/article/view/1877. Acesso em: 8 oct. 2025.