@article{li_meng_liu_yang_2018,  title={Magnetic Solid-Phase Extraction Combined with Dispersive Liquid-Liquid Microextraction Followed by HPLC for Determination of Four Aromatic Amines Released from Azo Dyes in Paper Samples},  volume={29},  ISSN={0103-5053},  url={https://doi.org/10.21577/0103-5053.20170198},  DOI={10.21577/0103-5053.20170198},  number={4},  journal={Journal of the Brazilian Chemical Society},  publisher={Sociedade Brasileira de Química},  author={Li, Xiaolan and Meng, Dongling and Liu, Ruiqi and Yang, Yaling},  year={2018},  month={Apr},  pages={757–765} }