Terra, Fabrício da Silva, et al. “Soil and Canopy Contributions in a Predictive Model of Aerial Biomass in the Pampa Biome”. Pesquisa Agropecuaria Brasileira, vol. 45, no. 4, Jan. 2011, pp. 384-90, doi:10.1590/S1678-3921.pab2010.v45.6076.