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\bibitem{Zaidi*_etal2015} Zaidi*, F. K., Nazzal, Y., Ahmed, I., Al-Bassam, A. M., Al-Arifi, N. S., Ghrefat, H., et al. (2015). Hydrochemical processes governing groundwater quality of sedimentary aquifers in Central Saudi Arabia and its environmental implications. \textit{Environ. Earth Sci.}, \textit{74}, 1555--1568.

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