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\bibitem{Gysels_etal2002} {\textquotedblleft}\textit{Characterisation of particulate matter in the Royal Museum of Fine Arts, Antwerp, Belgium}{\textquotedblright}. Gysels K, Deutsch F, Van Grieken R, Atmospheric environment : an international journal \textbf{36}, 4103 (2002).   http://doi.org/10.1016/S1352-2310(02)00229-7

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