Menezes, Humberto. “Immunization of Human Belngs With a Live Avirulent Strain of Trypanosoma Cruzi (Preliminary Report)”. Revista Do Instituto De Medicina Tropical De São Paulo, vol. 13, no. 2, Apr. 1971, pp. 144-5, https://revistas.usp.br/rimtsp/article/view/199182.