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\bibitem{Belmans_etal1993} {\textquotedblleft}\textit{Geochemical characterization of recent sediments in the Baltic Sea by bulk and electron microprobe analysis}{\textquotedblright}. Belmans F, Van Grieken R, Br{\"u}gmann L, Marine chemistry \textbf{42}, 223 (1993).   http://doi.org/10.1016/0304-4203(93)90014-F

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