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\bibitem{Pentcheva_etal1995} {\textquotedblleft}\textit{Influence of recent volcanism on the geochemical behaviour of trace elements and gases in deep granitic hydrothermal systems, southwest Bulgaria}{\textquotedblright}. Pentcheva EN, Van {\textquoteright}t dack L, Gijbels R, , 383 (1995)

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