Tovar O., A., E. Kabela, O. Cabello, and F. Valenzuela. “Luminous Model of the Cardiac Conduction System”. Revista Mexicana De Ingenieria Biomedica, vol. 9, no. 1, Oct. 1988, p. 6, https://rmib.com.mx/index.php/rmib/article/view/600.