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\bibitem{Schalm_etal2007} {\textquotedblleft}\textit{Composition of 12-18th century window glass in Belgium : non-figurative windows in secular buildings and stained-glass windows in religious buildings}{\textquotedblright}. Schalm O, Janssens K, Wouters H, Caluw{\'e} D, Spectrochimica acta: part B : atomic spectroscopy
T2 -- 18th International Congress on X-Ray Optics and Microanalysis, September 25-30, 2005, National Institute of Nuclear Physics, Frascati, Italy \textbf{62}, 663 (2007).   http://doi.org/10.1016/J.SAB.2007.03.006

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