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\bibitem{Varouchakis_etal2020} Varouchakis, E. A., Theodoridou, P. G., \& Karatzas, G. P. (2020). Decision-making tool for groundwater level spatial distribution and risk assessment using geostatistics in R. \textit{J. Hazard. Toxic Radioact. Waste}, \textit{24 (1)}, 04019031.

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