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\bibitem{Verreydt_etal2010} {\textquotedblleft}\textit{Passive samplers for monitoring VOCs in groundwater and the prospects related to mass flux measurements}{\textquotedblright}. Verreydt G, Bronders J, van Keer I, Diels L, Vanderauwera P, Ground water monitoring and remediation \textbf{30}, 114 (2010).   http://doi.org/10.1111/J.1745-6592.2010.01281.X

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