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\bibitem{Al-Emam_etal2021} {\textquotedblleft}\textit{Removal of a past varnish treatment from a 19th-century Belgian wall painting by means of a solvent-loaded double network hydrogel}{\textquotedblright}. Al-Emam E, Beltran V, De Meyer S, Nuyts G, Wetemans V, De Wael K, Caen J, Janssens K, Polymers \textbf{13}, 2651 (2021).   http://doi.org/10.3390/POLYM13162651

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