A. T. Tardin, G. V. de Assunção, and J. V. Soares, “Preliminary analysis of tm data for coffee, citrus and sugarcane discrimination in Furnas region, MG, Brazil”, PAB, vol. 27, no. 9, pp. 1355–1361, Sep. 1992, doi: 10.1590/S1678-3921.pab1992.v27.3778.