Söderström, M., Isendahl, C., Eriksson, J., Araújo, S. R., Rebellato, L., Schaan, D. P., & Stenborg, P. (2013). Using proximal soil sensors and fuzzy classification for mapping Amazonian Dark Earths. Agricultural and Food Science, 22(4), 380–389. https://doi.org/10.23986/afsci.8195