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\bibitem{Blommaert_etal1980} {\textquotedblleft}\textit{Relative evaluation of neutron activation, X-ray fluorescence and spark source mass spectrometry for multi-element analysis of geothermal waters}{\textquotedblright}. Blommaert W, Vandelannoote R, Van {\textquoteright}t dack L, Gijbels R, van Grieken R, Journal of radioanalytical chemistry \textbf{57}, 382 (1980)

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