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\bibitem{Vermeulen_etal2017} {\textquotedblleft}\textit{The darkening of copper- or lead-based pigments explained by a structural modification of natural orpiment : a spectroscopic and electrochemical study}{\textquotedblright}. Vermeulen M, Sanyova J, Janssens K, Nuyts G, De Meyer S, De Wael K, Journal of analytical atomic spectrometry \textbf{32}, 1331 (2017).   http://doi.org/10.1039/C7JA00047B

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