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\bibitem{Chen_etal2007} Chen, M., Li, L., Grace, J., Tazaki, K., Shiraki, K., Asada, R., et al. (2007). Remediation of acid rock drainage by regenerable natural clinoptilolite. \textit{Water, Air, Soil Pollut.}, \textit{180}(1-4), 11--27.

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