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\bibitem{Salvado_etal2019} {\textquotedblleft}\textit{Identification and distribution of metal soaps and oxalates in oil and tempera paint layers in fifteenth-century altarpieces using synchrotron radiation Techniques}{\textquotedblright}. Salvad{\'o} N, But{\'\i} S, Pradell T, Beltran V, Cinque G, Juanhuix J page 195 (2019).

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