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\bibitem{Janssens_etal2016} {\textquotedblleft}\textit{Rembrandt{\textquoteright}s {\textquoteright}Saul and David{\textquoteright} (c. 1652) : use of multiple types of smalt evidenced by means of non-destructive imaging}{\textquotedblright}. Janssens K, van der Snickt G, Alfeld M, Noble P, van Loon A, Delaney J, Conover D, Zeibel J, Dik J, Microchemical journal \textbf{126}, 515 (2016).   http://doi.org/10.1016/J.MICROC.2016.01.013

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