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\bibitem{Alfeld_etal2013} {\textquotedblleft}\textit{Revealing hidden paint layers in oil paintings by means of scanning macro-XRF : a mock-up study based on Rembrandt{\textquoteright}s {\textquotedblleft}An old man in military costume{\textquotedblright}}{\textquotedblright}. Alfeld M, de Nolf W, Cagno S, Janssens K, et al, Journal of analytical atomic spectrometry \textbf{28}, 40 (2013).   http://doi.org/10.1039/C2JA30119A

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