Alves, B. J. R.; Zotarelli, L.; Fernandes, F. M.; Heckler, J. C.; Macedo, R. A. T. de; Boddey, R. M.; Jantalia, C. P.; Urquiaga, S. Biological Nitrogen Fixation and Nitrogen Fertilizer on the Nitrogen Balance of Soybean, Maize and Cotton. PAB 2006, 41 (3), 449-456. https://doi.org/10.1590/S1678-3921.pab2006.v41.7158.