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\bibitem{vanderSnickt_etal2018} {\textquotedblleft}\textit{In situ macro X-ray fluorescence (MA-XRF) scanning as a non-invasive tool to probe for subsurface modifications in paintings by PP Rubens}{\textquotedblright}. van der Snickt G, Legrand S, Slama I, Van Zuien E, Gruber G, Van der Stighelen K, Klaassen L, Oberthaler E, Janssens K, Microchemical journal \textbf{138}, 238 (2018).   http://doi.org/10.1016/J.MICROC.2018.01.019

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