Ribeiro-Netto, A., et al. “Q Fever Study in São Paulo ( Brazil ). I - Occurrence in Dairy Herds from Paraiba Valley”. Revista Do Instituto De Medicina Tropical De São Paulo, vol. 6, no. 4, Aug. 1964, pp. 137-41, https://www.revistas.usp.br/rimtsp/article/view/202221.