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\bibitem{Moropoulou_etal1998} {\textquotedblleft}\textit{Origin and growth of weathering crusts on ancient marbles in industrial atmosphere}{\textquotedblright}. Moropoulou A, Bisbikou K, Torfs K, Van Grieken R, Zezza F, Macri F, Atmospheric environment : an international journal \textbf{32}, 967 (1998).   http://doi.org/10.1016/S1352-2310(97)00129-5

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