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\bibitem{Schalm_etal2003} {\textquotedblleft}\textit{Characterization of the main causes of deterioration of grisaille paint layers in 19th C. stained-glass windows by J.-B. Capronnier}{\textquotedblright}. Schalm O, Janssens K, Caen J, Spectrochimica acta: part B : atomic spectroscopy \textbf{58}, 589 (2003).   http://doi.org/10.1016/S0584-8547(02)00282-3

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