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\bibitem{vanAlsenoy_etal1993} {\textquotedblleft}\textit{Elemental concentrations and heavy metal pollution in sediments and suspended matter from the Belgian North Sea and the Scheldt estuary}{\textquotedblright}. van Alsenoy V, Bernard P, Van Grieken R, The science of the total environment \textbf{133}, 153 (1993).   http://doi.org/10.1016/0048-9697(93)90119-Q

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