@article{souza_braga_oliveira_filho_2016,  title={Concentration of manganese tailings via reverse flotation in an acid médium},  volume={69},  ISSN={0370-4467},  url={https://doi.org/10.1590/0370-44672015690069},  DOI={10.1590/0370-44672015690069},  number={1},  journal={Rem: Revista Escola de Minas},  publisher={Escola de Minas},  author={Souza, Helder Silva and Braga, Andre Soares and Oliveira, Arildo Henrique de and Filho, Laurindo de Salles Leal},  year={2016},  month={Jan},  pages={85–90} }