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\bibitem{Stranger_etal2009} {\textquotedblleft}\textit{Analysis of indoor gaseous formic and acetic acid, using radial diffusive samplers}{\textquotedblright}. Stranger M, Potgieter-Vermaak S, Sacco P, Quaglio F, Pagani D, Cocheo C, Godoi AFL, Van Grieken R, Environmental monitoring and assessment \textbf{149}, 411 (2009).   http://doi.org/10.1007/S10661-008-0217-6

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