Pacheco, Leandro Pereira, et al. “Biomass Yield in Production Systems of Soybean Sown in Succession to Annual Crops and Cover Crops”. Pesquisa Agropecuaria Brasileira, vol. 52, no. 8, Sept. 2017, pp. 582-91, doi:10.1590/S1678-3921.pab2017.v52.23890.