OCKREGLICKI, A. Answer to ECG Quiz no. 27. SA Heart Journal, [S. l.], v. 9, n. 2, p. 122–125, 2017. DOI: 10.24170/9-2-1859. Disponível em: https://www.journals.ac.za/SAHJ/article/view/1859. Acesso em: 8 oct. 2025.