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\bibitem{Pentcheva_etal1992} {\textquotedblleft}\textit{Correlations g{\'e}othermom{\'e}triques des {\'e}l{\'e}ments-traces des hydrothermes de terrains granitiques (Bulgarie M{\'e}ridionale)}{\textquotedblright}. Pentcheva EN, Van {\textquoteright}t dack L, Veldeman E, Gijbels R, Doklady na Balgarskata Akademija na Naukite \textbf{44}, 85 (1992)

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