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\bibitem{Silva_etal2018} Silva, P., Campos, J., Cunha, L., \& Mancini, L. (2018). Relationships of stable isotopes, water-rock interaction and salinization in fractured aquifers, Petrolina region, Pernambuco State, Brazil. \textit{REM -- International Engineering Journal}, \textit{71}, 19--25.

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