Oliveira, Sérgio José de, et al. “Molecular Diagnosis of Leptospira Spp. In Culled Sows”. Brazilian Journal of Veterinary Research and Animal Science, vol. 44, no. 1, Feb. 2007, pp. 18-23, https://doi.org/10.11606/issn.1678-4456.bjvras.2007.26655.