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\bibitem{Roekens+VanGrieken1989} {\textquotedblleft}\textit{Rates of air pollution induced surface recession and material loss for a cathedral in Belgium}{\textquotedblright}. Roekens E, Van Grieken R, Atmospheric environment \textbf{23}, 271 (1989).   http://doi.org/10.1016/0004-6981(89)90119-4

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