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\bibitem{vanderLinden_etal2009} {\textquotedblleft}\textit{Deeply coloured and black glass in the Northern provinces of the Roman Empire : differences and similarities in chemical composition before and after AD 150}{\textquotedblright}. van der Linden V, Cosyns P, Schalm O, Cagno S, Nys K, Janssens K, Nowak A, Wagner B, Bulska E, Archaeometry \textbf{51}, 822 (2009).   http://doi.org/10.1111/J.1475-4754.2008.00434.X

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