@article{ramos_dantas neto_dantas_1997,  title={APPLICATION OF AN EXPERIMENTAL METHODOLOGY IN THE OPTIMIZATION OF A TUNGSTEN CONCENTRATION PROCESS BY MICROEMULSIONS},  volume={14},  ISSN={0104-6632},  url={https://doi.org/10.1590/S0104-66321997000200008},  DOI={10.1590/S0104-66321997000200008},  number={2},  journal={Brazilian Journal of Chemical Engineering},  publisher={Brazilian Society of Chemical Engineering},  author={RAMOS, A.C.S. and DANTAS NETO, A.A. and DANTAS, T.N.C.},  year={1997},  month={Jun},  pages={159–165} }