SCOTT, R.; CHIN, A. ECG Quiz Answer 49. SA Heart Journal, [S. l.], v. 15, n. 1, p. 50–52, 2018. DOI: 10.24170/15-1-2906. Disponível em: https://www.journals.ac.za/SAHJ/article/view/2906. Acesso em: 8 oct. 2025.