MEDEIROS, Paulo de Tarso Jorge, and Eduardo Arraes ROCHA. “Eletrocardiograma De Marcapasso: Eletrocardiograma De Marcapasso”. JOURNAL OF CARDIAC ARRHYTHMIAS, vol. 10, no. 3, Oct. 1997, pp. 160-1, https://www.jca.org.br/jca/article/view/3099.