de Mendonça, Marcio Mattos, Segundo Sacramento Urquiaga, and Veronica Massena Reis. 2006. “Genotypic Variability of Maize for Nitrogen Accumulation and Contribution of Biological Nitrogen Fixation”. Pesquisa Agropecuaria Brasileira 41 (11):1681-85. https://doi.org/10.1590/S1678-3921.pab2006.v41.7332.