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\bibitem{Vos+VanGrieken1984} {\textquotedblleft}\textit{Preparation of conducting electrodes from biological samples for multi-element trace analysis by spark-source mass spectrometry or emission spectrometry}{\textquotedblright}. Vos L, Van Grieken R, Analytica chimica acta \textbf{164}, 83 (1984).   http://doi.org/10.1016/S0003-2670(00)85619-6

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