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\bibitem{Robberecht+VanGrieken1982} {\textquotedblleft}\textit{Selenium in environmental waters : determination, speciation and concentration levels}{\textquotedblright}. Robberecht H, Van Grieken R, Talanta : the international journal of pure and applied analytical chemistry \textbf{29}, 823 (1982).   http://doi.org/10.1016/0039-9140(82)80252-X

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