Rajão, Daniela Souza, et al. “Effects of Bovine Leukemia Virus Infection on Crossbred and Purebred Dairy Cattle Productive Performance in Brazil”. Semina: Ciências Agrárias, vol. 35, nº 2, abril de 2014, p. 891-00, doi:10.5433/1679-0359.2014v35n2p891.