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\bibitem{Injuk+VanGrieken1995} {\textquotedblleft}\textit{Atmospheric concentrations and deposition of heavy metals over the North Sea: a literature review}{\textquotedblright}. Injuk J, Van Grieken R, Journal of atmospheric chemistry \textbf{20}, 179 (1995).   http://doi.org/10.1007/BF00696557

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