@article{aguiar_ribeiro_ramos_cardoso_2021,  title={Soil characterization by near-infrared spectroscopy and principal component analysis},  volume={52},  ISSN={1806-6690},  url={https://doi.org/10.5935/1806-6690.20210004},  DOI={10.5935/1806-6690.20210004},  number={1},  journal={Revista Ciência Agronômica},  publisher={Universidade Federal do Ceará},  author={Aguiar, Maria Ivanilda de and Ribeiro, Livia Paulia Dias and Ramos, Aurea Pinto dos and Cardoso, Edson Lopes},  year={2021},  pages={e20196825} }