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\bibitem{Sweevers+VanGrieken1992} {\textquotedblleft}\textit{Analytical study of the deterioration of sandstone, marble and granite}{\textquotedblright}. Sweevers H, Van Grieken R, Atmospheric environment : an international journal \textbf{26b}, 159 (1992).   http://doi.org/10.1016/0957-1272(92)90019-O

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