@article{fearnside_2008,  title={Amazon Forest maintenance as a source of environmental services},  volume={80},  ISSN={0001-3765},  url={https://doi.org/10.1590/S0001-37652008000100006},  DOI={10.1590/S0001-37652008000100006},  number={1},  journal={Anais da Academia Brasileira de Ciências},  publisher={Academia Brasileira de Ciências},  author={Fearnside, Philip M.},  year={2008},  month={Mar},  pages={101–114} }