“Soil Surface Spectral Data from Landsat Imagery for Soil Class Discrimination - Doi: 10.4025 actasciagron.V34i1.12204”. Acta Scientiarum. Agronomy, vol. 34, nº 1, julho de 2011, p. 103-12, https://doi.org/10.4025/actasciagron.v34i1.12204.