Figuerêdo-Silva, José, et al. “ Epidemiological Survey of Trypanosoma Cruzi Infection in North-Eastern Brazil Using Different Diagnostic Methods ”. Revista Do Instituto De Medicina Tropical De São Paulo, vol. 33, no. 3, June 1991, pp. 193-8, https://www.revistas.usp.br/rimtsp/article/view/28818.