@article{korn_santos_guida_barbosa_passos_saraiva_lima_2010,  title={Evaluation of digestion procedures for simultaneous determination of Ca, P, Mg, K and Na in biodiesel by inductively coupled plasma optical emission spectrometry},  volume={21},  ISSN={0103-5053},  url={https://doi.org/10.1590/S0103-50532010001200015},  DOI={10.1590/S0103-50532010001200015},  number={12},  journal={Journal of the Brazilian Chemical Society},  publisher={Sociedade Brasileira de Química},  author={Korn, Maria Graças A. and Santos, Daniele Cristina M. B. and Guida, Mauro Agildo B. and Barbosa, Isa S. and Passos, Marieta L. C. and Saraiva, Maria Lúcia M. F. S. and Lima, José Luis F. C.},  year={2010},  month={Dec},  pages={2278–2284} }