SANT’ANNA, Joao Ricardo Michielin, et al. “Estimulaçao Atrioventricular Seqüencial No Modo VDD Com Eletrodo Fractal Flutuante Unico: Estimulaçao Atrioventricular Seqüencial No Modo VDD Com Eletrodo Fractal Flutuante Unico”. JOURNAL OF CARDIAC ARRHYTHMIAS, vol. 11, no. 4, Oct. 1998, pp. 186-90, https://www.jca.org.br/jca/article/view/3044.