@article{kowalska_2014,  title={Nanofiltration: ion exchange system for effective surfactant removal from water solutions},  volume={31},  ISSN={0104-6632},  url={https://doi.org/10.1590/0104-6632.20140314s00003087},  DOI={10.1590/0104-6632.20140314s00003087},  number={4},  journal={Brazilian Journal of Chemical Engineering},  publisher={Brazilian Society of Chemical Engineering},  author={Kowalska, I.},  year={2014},  month={Oct},  pages={887–894} }