Malhado, Carlos Henrique Mendes, et al. “Genetic Progress and Population Structure in Nellore Cattle in Bahia State, Brazil”. Pesquisa Agropecuaria Brasileira, vol. 43, no. 9, Oct. 2008, pp. 1163-9, doi:10.1590/S1678-3921.pab2008.v43.890.