@article{arruda_rodriguez_arruda_2003,  title={Ultrasound-assisted extraction of Ca, K and Mg from in vitro citrus culture},  volume={14},  ISSN={0103-5053},  url={https://doi.org/10.1590/S0103-50532003000300023},  DOI={10.1590/S0103-50532003000300023},  number={3},  journal={Journal of the Brazilian Chemical Society},  publisher={Sociedade Brasileira de Química},  author={Arruda, Sandra C. C. and Rodriguez, Adriana P. M. and Arruda, Marco A. Z.},  year={2003},  month={May},  pages={470–474} }