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\bibitem{Bichlmeier_etal2002} {\textquotedblleft}\textit{Comparative material characterization of historical and industrial samples by using a compact micro-XRF spectrometer}{\textquotedblright}. Bichlmeier S, Janssens K, Heckel J, Hoffmann P, Ortner HM, X-ray spectrometry \textbf{31}, 87 (2002).   http://doi.org/10.1002/XRS.563

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