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\bibitem{Hellar-Kihampa_etal2012} {\textquotedblleft}\textit{Elemental composition of bottom-sediments from Pangani river basin, Tanzania : lithogenic and anthropogenic sources}{\textquotedblright}. Hellar-Kihampa H, Potgieter-Vermaak S, van Meel K, Gatto Rotondo G, Kishimba M, Van Grieken R, Toxicological and environmental chemistry \textbf{94}, 525 (2012).   http://doi.org/10.1080/02772248.2011.648940

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