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\bibitem{Mudronja_etal2021} {\textquotedblleft}\textit{Protection of stone monuments using a brushing treatment with ammonium oxalate}{\textquotedblright}. Mudronja D, Vanmeert F, Fazinic S, Janssens K, Tibljas D, Desnica V, Coatings \textbf{11}, 379 (2021).   http://doi.org/10.3390/COATINGS11040379

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