Sugawara, Luciana Miura, Bernardo Friedrich Theodor Rudorff, and Marcos Adami. 2009. “Feasibility of the Use of Landsat Imagery to Map Soybean Crop Areas in Paraná, Brazil”. Pesquisa Agropecuaria Brasileira 43 (12):1777-83. https://doi.org/10.1590/S1678-3921.pab2008.v43.1053.