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\bibitem{Boonstra_etal1999} Boonstra, J., van Lier, R., Janssen, G., Dijkman, H., \& Buisman, C. J. N. (1999). Biological treatment of acid mine drainage. In R. Amils, \& A. Ballester (Eds.), \textit{Process Metallurgy, vol.9, Part B} (pp. 559--567). Biohydrometallurgy and the environment toward the mining of the 21st century; proceedings of the International biohydrometallurgy symposium IBS{\textquoteright}99, Part B, Molecular biology, biosorption, bioremediation.

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