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\bibitem{Al-Emam_etal2020} {\textquotedblleft}\textit{Characterization of polyvinyl alcohol-borax/agarose (PVA-B/AG) double network hydrogel utilized for the cleaning of works of art}{\textquotedblright}. Al-Emam E, Soenen H, Caen J, Janssens K, Heritage science \textbf{8}, 106 (2020).   http://doi.org/10.1186/S40494-020-00447-3

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