C. da S. Chagas, E. I. F. Filho, C. A. O. Vieira, C. E. G. R. Schaefer, and W. de C. Júnior, “Topographic attributes and Landsat7 data in the digital soil mapping using neural networks”, PAB, vol. 45, no. 5, pp. 497–507, Jan. 2011, doi: 10.1590/S1678-3921.pab2010.v45.3037.