Moreira, M.A. and Nitzsche, R.P. 1991. Analysis of vegetation indices from LANDSAT/TM and SPOT/XS data. Pesquisa Agropecuaria Brasileira. 26, 10 (Oct. 1991), 1583–1588. DOI:https://doi.org/10.1590/S1678-3921.pab1991.v26.3500.