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\bibitem{vanderSnickt_etal2010} {\textquotedblleft}\textit{James Ensor{\textquoteright}s pigment use: artistic and material evolution studied by means of portable X-ray fluorescence spectrometry}{\textquotedblright}. van der Snickt G, Janssens K, Schalm O, Aib{\'e}o C, Kloust H, Alfeld M, X-ray spectrometry \textbf{39}, 103 (2010).   http://doi.org/10.1002/XRS.1235

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