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\bibitem{Al-Omran_etal2017} Al-Omran, A. M., Aly, A. A., Al-Wabel, M. I., Al-Shayaa, M. S., Sallam, A. S., \& Nadeem, M. E. (2017). Geostatistical methods in evaluating spatial variability of groundwater quality in Al-Kharj Region, Saudi Arabia. \textit{Appl. Water Sci.}, \textit{7}, 4013--4023.

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