Baruffa, Giovanni, and Alcino Alcantara Filho. “Sorological Prevalence of Chagas Disease in Five Municipalities of South Region of Rio Grande Do Sul State-Brazil”. Revista Do Instituto De Medicina Tropical De São Paulo, vol. 16, no. 3, June 1974, pp. 140-4, https://revistas.usp.br/rimtsp/article/view/201083.