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\bibitem{Ramesh_etal1989} {\textquotedblleft}\textit{The elemental chemistry of sediments in the Krishna River basin, India}{\textquotedblright}. Ramesh R, Subramanian V, Van Grieken R, Van {\textquoteright}t dack L, Chemical geology \textbf{74}, 331 (1989).   http://doi.org/10.1016/0009-2541(89)90042-9

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