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\bibitem{Anaf_etal2015} {\textquotedblleft}\textit{Indoor particulate matter in four Belgian heritage sites : case studies on the deposition of dark-colored and hygroscopic particles}{\textquotedblright}. Anaf W, Bencs L, Van Grieken R, Janssens K, De Wael K, The science of the total environment \textbf{506}, 361 (2015).   http://doi.org/10.1016/J.SCITOTENV.2014.11.018

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