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\bibitem{Subramanian_etal1987} {\textquotedblleft}\textit{Heavy metals distribution in the sediments of Ganges and Brahmaputra rivers}{\textquotedblright}. Subramanian V, Van Grieken R, Van {\textquoteright}t dack L, Environmental geology \textbf{9}, 93 (1987).   http://doi.org/10.1007/BF02449940

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