OKREGLICKI, A. Answer to ECG Quiz no. 15. SA Heart Journal, [S. l.], v. 6, n. 2, p. 122–124, 2017. DOI: 10.24170/6-2-2003. Disponível em: https://www.journals.ac.za/SAHJ/article/view/2003. Acesso em: 8 oct. 2025.