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\bibitem{Robberecht+VanGrieken1983} {\textquotedblleft}\textit{Determination of trace selenium in biological material by preconcentration and X-ray emission spectrometry}{\textquotedblright}. Robberecht H, Van Grieken R, Analytica chimica acta \textbf{147}, 113 (1983).   http://doi.org/10.1016/0003-2670(83)80077-4

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