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\bibitem{Schalm_etal2011} {\textquotedblleft}\textit{Improved radiographic methods for the investigation of paintings using laboratory and synchrotron X-ray sources}{\textquotedblright}. Schalm O, Cabal A, van Espen P, Laqui{\`e}re N, Storme P, Journal of analytical atomic spectrometry \textbf{26}, 1068 (2011).   http://doi.org/10.1039/C0JA00242A

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