Electro Cardiogram and Its Normal Variations in Healthy Adults. Academia Journal of Medicine, [S. l.], v. 2, n. 2, p. 132–134, 2019. DOI: 10.48165/xhc56586. Disponível em: https://journals.acspublisher.com/index.php/ajm/article/view/19018. Acesso em: 9 apr. 2025.