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\bibitem{Robberecht_etal1982} {\textquotedblleft}\textit{Selenium in the Belgian soils and its uptake by rye-grass}{\textquotedblright}. Robberecht H, vanden Berghe D, Deelstra H, Van Grieken R, The science of the total environment \textbf{25}, 61 (1982).   http://doi.org/10.1016/0048-9697(82)90042-0

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