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\bibitem{Vanderstappen+VanGrieken1976} {\textquotedblleft}\textit{Trace metal analysis of sediments and particulate matter in sea water by energy-dispersive X-ray fluorescence}{\textquotedblright}. Vanderstappen M, Van Grieken R, Fresenius{\textquoteright} Zeitschrift f{\"u}r analytische Chemie \textbf{282}, 25 (1976).   http://doi.org/10.1007/BF00443774

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