Hashimoto, Vanessa Yumi, et al. “Association Between Microscopic kidney’s Lesions and Presence of Antibodies Against Leptospira Spp in Apparently Healthy Swine, Originated from Slaughterhouse in Northern Paraná State”. Semina: Ciências Agrárias, vol. 29, no. 4, Aug. 2008, pp. 875-80, doi:10.5433/1679-0359.2008v29n4p875.