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\bibitem{Araujo_etal1988} {\textquotedblleft}\textit{Heavy metal contamination in sediments from the Belgian coast and Scheldt estuary}{\textquotedblright}. Ara{\'u}jo MFD, Bernard PC, Van Grieken RE, Marine pollution bulletin \textbf{19}, 269 (1988).   http://doi.org/10.1016/0025-326X(88)90597-8

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