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\bibitem{Schalm_etal2010} {\textquotedblleft}\textit{Homogeneity, composition and deterioration of window glass fragments and paint layers from two seventeenth-century stained glass windows created by Jan de Caumont (similar to 1580-1659)}{\textquotedblright}. Schalm O, Caen J, Janssens K, Studies in conservation \textbf{55}, 216 (2010).   http://doi.org/10.1179/SIC.2010.55.3.216

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