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\bibitem{Vleugels_etal1994} {\textquotedblleft}\textit{Surface composition alteration of bare and treated limestones after ambient exposure}{\textquotedblright}. Vleugels G, Fobe B, Dewolfs R, Van Grieken R, The science of the total environment \textbf{151}, 59 (1994).   http://doi.org/10.1016/0048-9697(94)90486-3

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