@article{frena_tonietto_madureira_2013,  title={Application of solid phase microextraction and gas chromatography for the determination of BTEX in solid petroleum residues},  volume={24},  ISSN={0103-5053},  url={https://doi.org/10.5935/0103-5053.20130194},  DOI={10.5935/0103-5053.20130194},  number={9},  journal={Journal of the Brazilian Chemical Society},  publisher={Sociedade Brasileira de Química},  author={Frena, Morgana and Tonietto, Alessandra Emanuele and Madureira, Luiz Augusto dos Santos},  year={2013},  month={Sep},  pages={1530–1536} }