Fonseca, E.L. da, Rosa, L.M.G. and Fontana, D.C. (2002) “Spectral characterization of Paspalum notatum under different nitrogen fertilization”, Pesquisa Agropecuaria Brasileira, 37(3), pp. 365–371. doi:10.1590/S1678-3921.pab2002.v37.6349.