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\bibitem{Boonstra_etal1999} Boonstra, J., van Lier, R., Janssen, G., Dijkman, H., Buisman, C. J. N., \& Ballester, R. A. and A. (1999). Biological treatment of acid mine drainage. In \textit{Process Metallurgy} (pp. 559--567). Volume 9, Part 2: Elsevier Science B.V.

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