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\bibitem{Sanchez-Moral_etal1999} {\textquotedblleft}\textit{Inorganic deterioration affecting the Altamira Cave, N Spain: quantitative approach to wall-corrosion (solutional etching) processes induced by visitors}{\textquotedblright}. S{\'a}nchez-Moral S, Soler V, Ca{\~n}averas JC, Sanz-Rubio E, Van Grieken R, Gysels K, The science of the total environment \textbf{243/244}, 67 (1999).   http://doi.org/10.1016/S0048-9697(99)00348-4

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