@article{doi_2012,  title={Quantification of leaf greenness and leaf spectral profile in plant diagnosis using an optical scanner},  volume={36},  ISSN={1413-7054},  url={https://doi.org/10.1590/S1413-70542012000300006},  DOI={10.1590/S1413-70542012000300006},  number={3},  journal={Ciência e Agrotecnologia},  publisher={Editora da Universidade Federal de Lavras},  author={Doi, Ryoichi},  year={2012},  month={May},  pages={309–317} }