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\bibitem{Claes_etal1999} {\textquotedblleft}\textit{Micro-analysis of artists{\textquoteright} pigments by grazing-emission X-ray fluorescence spectrometry}{\textquotedblright}. Claes M, van Ham R, Janssens K, Van Grieken R, Klockenk{\"a}mper R, von Bohlen A, Advances in X-ray analysis \textbf{41}, 262 (1999)

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