Rushel, A.P. and Ruschel, R. (2014) “Synergism of nitrogen uptake from soil and symbiotic nitrogen fixation increasing nitrogen in soybean plant ( Glycine max)”, Pesquisa Agropecuaria Brasileira, 10(11), pp. 37–40. doi:10.1590/S1678-3921.pab1975.v10.17107.