MILLAR, R. S. Answer to ECG Quiz no. 30. SA Heart Journal, [S. l.], v. 10, n. 2, p. 476–478, 2017. DOI: 10.24170/10-2-1809. Disponível em: https://www.journals.ac.za/SAHJ/article/view/1809. Acesso em: 8 oct. 2025.