@article{rosa_santana_carbonell_2007,  title={Determination of the liquid pool surfactant and protein concentration for semi-batch foam fractionation columns},  volume={24},  ISSN={0104-6632},  url={https://doi.org/10.1590/S0104-66322007000100001},  DOI={10.1590/S0104-66322007000100001},  number={1},  journal={Brazilian Journal of Chemical Engineering},  publisher={Brazilian Society of Chemical Engineering},  author={Rosa, P. T. V. and Santana, C. C. and Carbonell, R. G.},  year={2007},  month={Jan},  pages={1–14} }