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\bibitem{Pentcheva_etal1995} {\textquotedblleft}\textit{{\'E}tudes g{\'e}n{\'e}tiques du syst{\`e}me {\textquotedblleft}eau thermale -- gaz -- roche{\textquotedblright} sous l{\textquoteright}influence de ph{\'e}nom{\`e}nes volcaniques r{\'e}cents}{\textquotedblright}. Pentcheva EN, Petrov PS, Van {\textquoteright}t dack L, Gijbels R, Doklady Bolgarskoi Akademii Nauk \textbf{48}, 99 (1995)

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