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\bibitem{Joos_etal2003} {\textquotedblleft}\textit{Trace analysis of benzene, toluene, ethylbenzene and xylene isomers in environmental samples by low-pressure gas chromatography-ion trap mass spectrometry}{\textquotedblright}. Joos PE, Godoi AFL, de Jong R, de Zeeuw J, Van Grieken R, Journal of chromatography: A: bibliography section \textbf{985}, 191 (2003).   http://doi.org/10.1016/S0021-9673(02)01843-5

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