Johann, Jerry Adriani, et al. “Estimation of Summer Crop Areas in the State of Paraná, Brazil, Using Multitemporal EVI Modis Images”. Pesquisa Agropecuaria Brasileira, vol. 47, no. 9, Nov. 2012, pp. 1295-06, doi:10.1590/S1678-3921.pab2012.v47.11134.