O. H. de C. Pias, A. L. Santi, M. R. Cherubin, J. Berghetti, and T. C. de Oliveira, “Characterization of spatial variability of the relative chlorophyll index in wheat crop”, Pesq. Agropec. Trop., vol. 44, no. 4, pp. 451–459, Dec. 2014, doi: 10.5216/pat.v44i4.29427.