@article{perna_cremasco_santana_2015,  title={CHROMATOGRAPHIC SEPARATION OF VERAPAMIL RACEMATE USING A VARICOL CONTINUOUS MULTICOLUMN PROCESS},  volume={32},  ISSN={0104-6632},  url={https://doi.org/10.1590/0104-6632.20150324s00003692},  DOI={10.1590/0104-6632.20150324s00003692},  number={4},  journal={Brazilian Journal of Chemical Engineering},  publisher={Brazilian Society of Chemical Engineering},  author={Perna, R. F. and Cremasco, M. A. and Santana, C. C.},  year={2015},  month={Oct},  pages={929–939} }