Lopes, Edison Reis, et al. “Guerreiro and Machado Serological Reaction in the Pericardic Fluid of Patients With Chronic Chagas’ Disease”. Revista Do Instituto De Medicina Tropical De São Paulo, vol. 8, no. 2, Apr. 1966, pp. 60-61, https://revistas.usp.br/rimtsp/article/view/201892.