Pinheiro, H. S. K., Chagas, C. da S., Carvalho Júnior, W. de, & Anjos, L. H. C. dos. (2012). Elevation models for obtaining terrain attributes used in digital soil mapping. Pesquisa Agropecuaria Brasileira, 47(9), 1384–1394. https://doi.org/10.1590/S1678-3921.pab2012.v47.11091