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\bibitem{vanGrieken_etal1978} {\textquotedblleft}\textit{Geothermal water analysis by X-ray fluorescence and neutron activation}{\textquotedblright}. van Grieken R, Gijbels R, Blommaert W, Vandelannoote R, Van {\textquoteright}t dack L US Energy Research and Development Administration, S.l., page 368 (1978).

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