(1)
Ruschel, A. P.; Ruschel, R.; Almeida, D. L. de; Suhet, A. R. Influence of Mineral and Organic Nitrogen on Symbiotic Fixation of Nitrogen by Soybeans. PAB 2014, 9 (10), 125-129. https://doi.org/10.1590/S1678-3921.pab1974.v9.17271.