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\bibitem{Sholkovitz_etal1978} {\textquotedblleft}\textit{The major-element composition of suspended matter in the Zaire river and estuary}{\textquotedblright}. Sholkovitz ER, Van Grieken R, Eisma D, Netherlands journal of sea research \textbf{12}, 407 (1978).   http://doi.org/10.1016/0077-7579(78)90042-X

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