Pissaia, Amir, and José Antonio Costa. “Effects of Artificial Defoliation in Grain Yield and Its Components in Two Soybean Cultivars”. Pesquisa Agropecuaria Brasileira, vol. 16, no. 4, Apr. 2014, pp. 507-16, doi:10.1590/S1678-3921.pab1981.v16.16983.