Sugawara, L. M.; Rudorff, B. F. T.; Adami, M. Feasibility of the Use of Landsat Imagery to Map Soybean Crop Areas in Paraná, Brazil. PAB 2009, 43 (12), 1777-1783. https://doi.org/10.1590/S1678-3921.pab2008.v43.1053.