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\bibitem{Benkovics_etal1997} Benkovics, I., Csics{\'a}k, J., Cs{\"o}v{\'a}ri, M., Lendvai, Z., \& Moln{\'a}r, J. (1997). Mine Water Treatment  Anion-exchange and Membrane Process. \textit{Proceedings, 6th International Mine Water Association Congress, Bled, Slovenia}, \textit{1}, 149--157.

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