PARRALES LÓPEZ, Hugo Daniel. Fast method to determine the cardiac axis with D1 and D3. Alerta, Revista científica del Instituto Nacional de Salud, [S. l.], v. 6, n. 2, p. 172–178, 2023. DOI: 10.5377/alerta.v6i2.15444. Disponível em: https://www.camjol.info/index.php/alerta/article/view/15444. Acesso em: 6 dec. 2025.