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\bibitem{daPieve_etal2013} {\textquotedblleft}\textit{Casting light on the darkening of colors in historical paintings}{\textquotedblright}. da Pieve F, Hogan C, Lamoen D, Verbeeck J, Vanmeert F, Radepont M, Cotte M, Janssens K, Gonze X, Van Tendeloo G, Physical review letters \textbf{111}, 208302 (2013).   http://doi.org/10.1103/PhysRevLett.111.208302

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