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\bibitem{Ntengwe2005} Ntengwe, F. W. (2005). An overview of industrial wastewater treatment and analysis as means of preventing pollution of surface and underground water bodies -- The case of Nkana Mine in Zambia. \textit{Phys. Chem. Earth}, \textit{30}(11-16 Spec. Iss.), 726--734.

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