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\bibitem{Das_etal1995} {\textquotedblleft}\textit{The elemental chemistry of sediments in the Nainital lake, Kumaun Himalaya, India}{\textquotedblright}. Das BK, Singh M, Van Grieken R, The science of the total environment \textbf{168}, 85 (1995).   http://doi.org/10.1016/0048-9697(95)04242-S

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