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\bibitem{Robberecht+VanGrieken1980} {\textquotedblleft}\textit{Sub-part-per-billion determination of total dissolved selenium and selenite in environmental waters by X-ray fluorescence spectrometry}{\textquotedblright}. Robberecht HJ, Van Grieken RE, Analytical chemistry \textbf{52}, 449 (1980).   http://doi.org/10.1021/AC50053A017

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