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\bibitem{VanGrieken_etal1998} {\textquotedblleft}\textit{Cultural heritage and the environment}{\textquotedblright}. Van Grieken R, Delalieux F, Gysels K, Pure and applied chemistry \textbf{70}, 2327 (1998).   http://doi.org/10.1351/PAC199870122327

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