@article{toneli_carvalho_2011,  title={Sub-pixel estimation of tree cover and bare surface densities using regression tree analysis},  volume={17},  ISSN={0104-7760},  url={https://doi.org/10.1590/S0104-77602011000300016},  DOI={10.1590/S0104-77602011000300016},  number={3},  journal={CERNE},  publisher={UFLA - Universidade Federal de Lavras},  author={Toneli, Carlos Augusto Zangrando and Carvalho, Luis Marcelo Tavares de},  year={2011},  month={Jul},  pages={411–416} }