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\bibitem{VanGrieken_etal1992} {\textquotedblleft}\textit{Fluxes and sources of heavy metal inputs into the Southern Bight of the North Sea}{\textquotedblright}. Van Grieken R, Injuk J, Otten P, Rojas C, van Malderen H, Laane R page 184 (1992).

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