Höfig, Pedro, Elvio Giasson, and Pedro Rodolfo Siqueira Vendrame. 2014. “Digital Soil Mapping Based on Map Extrapolation Between Physiographically Similar Areas”. Pesquisa Agropecuaria Brasileira 49 (12): 958-66. https://doi.org/10.1590/S1678-3921.pab2014.v49.19539.