Camargo, Mario E., Paulo G. Leser, and Antonieta Rocca. 1972. “Rheumatoid Factors As a Cause for False Positive IgM Anti-Toxoplasma Fluorescent Tests. A Technique for Specific Results”. Revista Do Instituto De Medicina Tropical De São Paulo 14 (5): 310-13. https://revistas.usp.br/rimtsp/article/view/198825.