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\bibitem{vanderSnickt_etal2016} {\textquotedblleft}\textit{Exploring a hidden painting below the surface of Rene Magritte{\textquoteright}s Le Portrait}{\textquotedblright}. van der Snickt G, Martins A, Delaney J, Janssens K, Zeibel J, Duffy M, McGlinchey C, Van Driel B, Dik J, Applied spectroscopy \textbf{70}, 57 (2016).   http://doi.org/10.1177/0003702815617123

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