Free iron oxide content in tropical soils predicted by integrative digital mapping - Mendes, Wanderson de Sousa; Demattê, José Alexandre Melo; Minasny, Budiman; ilvero, Nélida E. Q; Bonfatti, Benito R; Safanelli, José Lucas; Rizzo, Rodnei; Costa, Antonio Carlos Saraiva da (Soil & Tillage Research, 2022)