Chapadeiro, E., et al. “ Neuronal Counting and Parasympathetic Dysfunction in the Hearts of Chronically Trypanosoma Cruzi - Infected Rats ”. Revista Do Instituto De Medicina Tropical De São Paulo, vol. 33, no. 5, Oct. 1991, pp. 337-41, https://www.revistas.usp.br/rimtsp/article/view/28851.