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\bibitem{Veldeman_etal1991} {\textquotedblleft}\textit{Sulfur species and associated trace elements in south-west Bulgarian thermal waters}{\textquotedblright}. Veldeman E, Van {\textquoteright}t dack L, Gijbels R, Pentcheva E, Applied geochemistry \textbf{6}, 49 (1991)

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