OKREGLICKI, A. Answer to ECG Quiz no. 13. SA Heart Journal, [S. l.], v. 5, n. 4, p. 188–190, 2017. DOI: 10.24170/5-4-2030. Disponível em: https://www.journals.ac.za/SAHJ/article/view/2030. Acesso em: 8 oct. 2025.