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\bibitem{Alfeld+Broekaert2013} {\textquotedblleft}\textit{Mobile depth profiling and sub-surface imaging techniques for historical paintings : a review}{\textquotedblright}. Alfeld M, Broekaert JAC, Spectrochimica acta: part B : atomic spectroscopy \textbf{88}, 211 (2013).   http://doi.org/10.1016/J.SAB.2013.07.009

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