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\bibitem{VanGrieken_etal1989} {\textquotedblleft}\textit{Spectroscopy and ion chromatography to study the effects of air pollution on historical buildings}{\textquotedblright}. Van Grieken R, Roekens E, Sweevers H, Vleugels G, Spectroscopy \textbf{10}, 70 (1989)

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