Bueno, S. C. V., and A. D. . Lourenço. “Persistence of Left Superior Vena Cava in Patient Submitted a Pacemaker Implantation”. JOURNAL OF CARDIAC ARRHYTHMIAS, vol. 32, no. 1, Oct. 2019, pp. 49-51, https://jca.emnuvens.com.br/jca/article/view/15.