Accioly, Luciano José de Oliveira, and Alfredo Ramon Huete. 2000. “Soil Spectral Response in Relation to Viewing Angle, Soil Moisture and Surface Roughness”. Pesquisa Agropecuaria Brasileira 35 (12):2473-84. https://doi.org/10.1590/S1678-3921.pab2000.v35.6043.