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\bibitem{Vandelannoote_etal1981} {\textquotedblleft}\textit{Analysis of geothermal waters by spark source mass spectrometry}{\textquotedblright}. Vandelannoote R, Blommaert W, Gijbels R, van Grieken R, Fresenius{\textquoteright} Zeitschrift f{\"u}r analytische Chemie \textbf{309}, 291 (1981).   http://doi.org/10.1007/BF00488604

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