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\bibitem{Potgieter-Vermaak_etal2005} {\textquotedblleft}\textit{Micro-structural characterization of black crust and laser cleaning of building stones by micro-Raman and SEM techniques}{\textquotedblright}. Potgieter-Vermaak SS, Godoi RHM, Van Grieken R, Potgieter JH, Oujja M, Castillejo M, Spectrochimica acta: part A: molecular and biomolecular spectroscopy \textbf{61}, 2460 (2005).   http://doi.org/10.1016/J.SAA.2004.09.010

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