@article{usman_sattar_hussain_muhammad_asghar_afzal_2009,  title={Drop size in a liquid pulsed sieve-plate extraction column},  volume={26},  ISSN={0104-6632},  url={https://doi.org/10.1590/S0104-66322009000400006},  DOI={10.1590/S0104-66322009000400006},  number={4},  journal={Brazilian Journal of Chemical Engineering},  publisher={Brazilian Society of Chemical Engineering},  author={Usman, M. R. and Sattar, H. and Hussain, S. N. and Muhammad, H. and Asghar, A. and Afzal, W.},  year={2009},  month={Oct},  pages={677–683} }