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\bibitem{Roekens_etal1988} {\textquotedblleft}\textit{Chemistry of precipitation near a limestone building}{\textquotedblright}. Roekens E, Komy Z, Leysen L, Veny P, Van Grieken R, Water, air and soil pollution \textbf{38}, 273 (1988).   http://doi.org/10.1007/BF00280759

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