@article{fiorio_demattê_2009,  title={Orbital and laboratory spectral data to optimize soil analysis},  volume={66},  ISSN={0103-9016},  url={https://doi.org/10.1590/S0103-90162009000200015},  DOI={10.1590/S0103-90162009000200015},  number={2},  journal={Scientia Agricola},  publisher={Escola Superior de Agricultura "Luiz de Queiroz"},  author={Fiorio, Peterson Ricardo and Demattê, José Alexandre M.},  year={2009},  month={Mar},  pages={250–257} }