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\bibitem{Marengo*_etal2008} Marengo*, E., Gennaro, M. C., Robotti, E., Maiocchi, A., Pavese, G., Indaco, A., et al. (2008). Statistical analysis of ground water distribution in Alessandria Province (Piedmont{\textemdash}Italy). \textit{Microchem. J.}, \textit{88}, 167--177.

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