Santos, Alessandro José Ferreira dos, et al. “Seroconversion Attributable to Vaccination of Heifers With the Strain B-19 of Brucella Abortus”. Semina: Ciências Agrárias, vol. 40, no. 3, May 2019, pp. 1145-52, doi:10.5433/1679-0359.2019v40n3p1145.