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\bibitem{Schalm_etal2009} {\textquotedblleft}\textit{Enamels in stained glass windows: preparation, chemical composition, microstructure and causes of deterioration}{\textquotedblright}. Schalm O, van der Linden V, Frederickx P, Luyten S, van der Snickt G, Caen J, Schryvers D, Janssens K, Cornelis E, van Dyck D, Schreiner M, Spectrochimica acta: part B : atomic spectroscopy \textbf{64}, 812 (2009).   http://doi.org/10.1016/j.sab.2009.06.005

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