KANEKO, FLAVIO HIROSHI, et al. “BIOLOGICAL NITROGEN FIXATION, SOURCES AND LEVELS OF N INCREASE THE MAIZE GRAIN YIELD IN CERRADO”. REVISTA BRASILEIRA DE MILHO E SORGO, vol. 18, no. 2, Dec. 2019, pp. 234-4, doi:10.18512/1980-6477/rbms.v18n2p234-244.