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\bibitem{Caen_etal2005} {\textquotedblleft}\textit{Enamels in stained-glass windows : preparation, chemical composition, microstructure and causes of deterioration}{\textquotedblright}. Caen J, Schalm O, van der Snickt G, van der Linden V, Frederickx P, Schryvers D, Janssens K, Cornelis E, van Dyck D, Schreiner M, , 121 (2005)

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