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\bibitem{Janssens_etal2003} {\textquotedblleft}\textit{The use of focussed X-ray beams for non-destructive characterization of historical materials: from elemental trace analysis towards chemical state investigations}{\textquotedblright}. Janssens K, Proost K, Deraedt I, Bulska E, Wagner B, Schreiner M, , 193 (2003)

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