J. R. Machado, D. A. S. Marcondes, J. Nakagawa, and C. A. Rosolem, “Effect of weed competition on grain sorghum yield”, PAB, vol. 20, no. 6, pp. 667–676, Apr. 2014, doi: 10.1590/S1678-3921.pab1985.v20.15719.