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\bibitem{Galazoulas+Petalas2014} Galazoulas, E. C., \& Petalas, C. P. (2014). Application of multivariate statistical procedures on major ions and trace elements in a multilayered coastal aquifer: the case of the south Rhodope coastal aquifer. \textit{Environmental earth sciences}, \textit{72}(10), 4191--4205.

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