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\bibitem{Martin_etal1978} {\textquotedblleft}\textit{Trace element composition of Zaire suspended sediments}{\textquotedblright}. Martin J-M, Thomas AJ, Van Grieken RE, Netherlands journal of sea research \textbf{12}, 414 (1978).   http://doi.org/10.1016/0077-7579(78)90043-1

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