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\bibitem{Potgieter-Vermaak_etal2011} {\textquotedblleft}\textit{Raman spectroscopy for the analysis of coal : a review}{\textquotedblright}. Potgieter-Vermaak S, Maledi N, Wagner N, van Heerden JHP, Van Grieken R, Potgieter JH, Journal of Raman spectroscopy \textbf{42}, 123 (2011).   http://doi.org/10.1002/JRS.2636

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