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\bibitem{Beltran_etal2021} {\textquotedblleft}\textit{Nanoscale analysis of historical paintings by means of O-PTIR spectroscopy : the identification of the organic particles in L{\textquoteright}Arl{\'e}sienne (portrait of Madame Ginoux) by Van Gogh}{\textquotedblright}. Beltran V, Marchetti A, Nuyts G, Leeuwestein M, Sandt C, Borondics F, De Wael K, Angewandte Chemie-International Edition \textbf{60}, 22753 (2021).   http://doi.org/10.1002/ANIE.202106058

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