OKREGLICKI, A. Answer to ECG Quiz no. 28. SA Heart Journal, [S. l.], v. 9, n. 3, p. 206–209, 2017. DOI: 10.24170/9-3-1845. Disponível em: https://www.journals.ac.za/SAHJ/article/view/1845. Acesso em: 8 oct. 2025.