A. P. Ruschel and H. W. Reuszer, “Development of nodulation and symbiotic nitrogen fixation of soybean ( Glycine max (L.) Merril) varieties at different phases of plant development”, PAB, vol. 8, no. 8, pp. 251–256, Apr. 2014, doi: 10.1590/S1678-3921.pab1973.v8.17554.