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\bibitem{Leysen_etal1987} {\textquotedblleft}\textit{Electron probe micro-analysis and laser microprobe mass analysis of material, leached from a limestone cathedral}{\textquotedblright}. Leysen LA, De Waele JK, Roekens EJ, Van Grieken RE, Scanning microscopy \textbf{1}, 1617 (1987)

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