Carvalho, L., Benesi, F. J., Birgel Junior, E. H., & Birgel, E. H. (1996). Prevalence of serie bovine leukosis virus antibodies in dairy cattle (Holstein) and beef cattle (Zebu/nelore) in Londrina, State of Paraná. Semina: Ciências Agrárias, 17(1), 53–57. https://doi.org/10.5433/1679-0359.1996v17n1p53