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\bibitem{VanHille_etal1999} Van Hille, R. P., Boshoff, G. A., Rose, P. D., \& Duncan, J. R. (1999). A continuous process for the biological treatment of heavy metal contaminated acid mine water. \textit{Resour. Conserv. Recycl.}, \textit{27}(1-2), 157--167.

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