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\bibitem{Robberecht_etal1990} {\textquotedblleft}\textit{Determination of selenium in blood components by X-ray emission spectrometry}{\textquotedblright}. Robberecht H, Deelstra H, Van Grieken R, Biological trace element research \textbf{25}, 149 (1990).   http://doi.org/10.1007/BF02990412

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