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\bibitem{Potgieter-Vermaak_etal2006} Potgieter-Vermaak, S. S., Potgieter, J. H., Monama, P., \& Van Grieken, R. (2006). Comparison of limestone, dolomite and fly ash as pre-treatment agents for acid mine drainage. \textit{Minerals Engineering}, \textit{19}(5), 454--462.

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