Madruga, C.R. et al. (2014) “Antibody levels and parasitemia of anaplasma marginale of nellore and ibagé calves and nellore crossbreds, in an enzootic area”, Pesquisa Agropecuaria Brasileira, 20(1), pp. 135–142. doi:10.1590/S1678-3921.pab1985.v20.15000.