@article{barros_zola_arroyo_sousa-aguiar_tavares_2003,  title={Binary ion exchange of metal ions in Y and X zeolites},  volume={20},  ISSN={0104-6632},  url={https://doi.org/10.1590/S0104-66322003000400008},  DOI={10.1590/S0104-66322003000400008},  number={4},  journal={Brazilian Journal of Chemical Engineering},  publisher={Brazilian Society of Chemical Engineering},  author={Barros, M.A.S.D. and Zola, A.S. and Arroyo, P.A. and Sousa-Aguiar, E.F. and Tavares, C.R.G.},  year={2003},  month={Oct},  pages={413–421} }