Viegas, E. de A., R. M. Yanaguita, S. A. R. de A. Viegas, L. A. Silva, and S. A. Vasconcellos. “Use of Leptospira Biflexa Strains in the Seroagglutination Test for Diagnosis of Leptospirosis in Sheeps and Goats”. Brazilian Journal of Veterinary Research and Animal Science, vol. 31, no. 1, Mar. 1994, pp. 25-30, doi:10.11606/issn.1678-4456.bjvras.1994.52045.