@article{guerra_viana_airoldi_2009,  title={Adsorption of thorium(IV) on chemically modified Amazon clays},  volume={20},  ISSN={0103-5053},  url={https://doi.org/10.1590/S0103-50532009000600023},  DOI={10.1590/S0103-50532009000600023},  number={6},  journal={Journal of the Brazilian Chemical Society},  publisher={Sociedade Brasileira de Química},  author={Guerra, Denis L. and Viana, Rúbia R. and Airoldi, Claudio},  year={2009},  pages={1164–1174} }