Saccol, A. V., Schneider, F. M., Estefanel, V., Buriol, G. A., & Heldwein, A. B. (1993). Competition of barnyardgrass on soybean cultivated in a hydromorphic soil. I. effect on weed dry matter production and soybean grain yield. Pesquisa Agropecuaria Brasileira, 28(7), 803–812. https://doi.org/10.1590/S1678-3921.pab1993.v28.3941