Oliveira, Gilson Pereira de, et al. “Resistance of Cattle to the Tick <i>Boophilus microplus< I>. II. Natural Infestation”. Pesquisa Agropecuaria Brasileira, vol. 24, no. 10, Apr. 2014, pp. 1267-71, doi:10.1590/S1678-3921.pab1989.v24.16478.