Camargo, Mario E., et al. “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, vol. 14, no. 5, Oct. 1972, pp. 310-3, https://revistas.usp.br/rimtsp/article/view/198825.