Reis Junior, Fábio Bueno dos, et al. “Occurrence of Diazotrophic Bacteria in Different Sugar Cane Genotypes”. Pesquisa Agropecuaria Brasileira, vol. 35, no. 5, May 2000, pp. 985-94, doi:10.1590/S1678-3921.pab2000.v35.5867.