Victoria, Daniel de Castro, et al. “Cropland Area Estimates Using Modis NDVI Time Series in the State of Mato Grosso, Brazil”. Pesquisa Agropecuaria Brasileira, vol. 47, no. 9, Nov. 2012, pp. 1270-8, doi:10.1590/S1678-3921.pab2012.v47.11460.