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\bibitem{Mudronja_etal2013} {\textquotedblleft}\textit{Efficiency of applying ammonium oxalate for protection of monumental limestone by poultice, immersion and brushing methods}{\textquotedblright}. Mudronja D, Vanmeert F, Hellemans K, Fazinic S, Janssens K, Tibljas D, Rogosic M, Jakovljevic S, Applied physics A : materials science \& processing \textbf{111}, 109 (2013).   http://doi.org/10.1007/S00339-012-7365-9

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