@article{flores_paniz_saidelles_barin_dressler_müller_costa_2004,  title={Direct solid sampling by flame atomic absorption spectrometry: determination of manganese in coal samples},  volume={15},  ISSN={0103-5053},  url={https://doi.org/10.1590/S0103-50532004000200007},  DOI={10.1590/S0103-50532004000200007},  number={2},  journal={Journal of the Brazilian Chemical Society},  publisher={Sociedade Brasileira de Química},  author={Flores, Érico M. M. and Paniz, José Neri G. and Saidelles, Ana Paula F. and Barin, Juliano S. and Dressler, Valderi L. and Müller, Edson I. and Costa, Adilson B.},  year={2004},  month={Mar},  pages={199–204} }