Chagas, C. da S. et al. 2011. Topographic attributes and Landsat7 data in the digital soil mapping using neural networks. Pesquisa Agropecuaria Brasileira. 45, 5 (Jan. 2011), 497–507. DOI:https://doi.org/10.1590/S1678-3921.pab2010.v45.3037.