@article{pereira_silva_afonso_mantovano_2011,  title={The importance of pre-treatment of spent hydrotreating catalysts on metals recovery},  volume={34},  ISSN={0100-4042},  url={https://doi.org/10.1590/S0100-40422011000100027},  DOI={10.1590/S0100-40422011000100027},  number={1},  journal={Química Nova},  publisher={Sociedade Brasileira de Química},  author={Pereira, Alexandre Luiz de Souza and Silva, Cristiano Nunes da and Afonso, Júlio Carlos and Mantovano, José Luiz},  year={2011},  pages={145–150} }