J. I. Baldani, R. A. G. Blana, and J. Dobereiner, “Interactions of nitrate-reductase and nitrogenase activities in maize genotypes”, PAB, vol. 14, no. 2, pp. 165–173, Apr. 2014, doi: 10.1590/S1678-3921.pab1979.v14.16676.