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\bibitem{Fobe_etal1995} {\textquotedblleft}\textit{Organic and inorganic compounds in limestone weathering crusts from cathedrals in Southern and Western Europe}{\textquotedblright}. Fobe BO, Vleugels GJ, Roekens EJ, Van Grieken RE, Hermosin B, Ortega-Calvo JJ, Sanchez del Junco A, Saiz-Jimenez C, Environmental science and technology \textbf{29}, 1691 (1995).   http://doi.org/10.1021/ES00006A038

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