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\bibitem{Ravindra_etal2006} {\textquotedblleft}\textit{Low-pressure gas chromatography-ion trap mass spectrometry for the fast determination of polycyclic aromatic hydrocarbons in air samples}{\textquotedblright}. Ravindra K, Godoi AFL, Bencs L, Van Grieken R, Journal of chromatography: A: bibliography section \textbf{1114}, 278 (2006).   http://doi.org/10.1016/J.CHROMA.2006.03.025

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