Sala, Valéria Marino Rodrigues, et al. “Wheat Genotypes Response to Inoculation of Diazotrophic Bacteria in Field Conditions”. Pesquisa Agropecuaria Brasileira, vol. 42, no. 6, June 2007, pp. 833-42, doi:10.1590/S1678-3921.pab2007.v42.7636.