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\bibitem{Mao_etal2009} {\textquotedblleft}\textit{Detailed analysis of petroleum hydrocarbon attenuation in biopiles by high-performance liquid chromatography followed by comprehensive two-dimensional gas chromatography}{\textquotedblright}. Mao D, Lookman R, van de Weghe H, Vanermen G, de Brucker N, Diels L, Journal of chromatography : A \textbf{1216}, 1524 (2009).   http://doi.org/10.1016/J.CHROMA.2008.12.087

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