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\bibitem{Hellar-Kihampa_etal2013} {\textquotedblleft}\textit{Water quality assessment in Pangani river basin, Tanzania : natural and anthropogenic influences on concentrations of nutrients and inorganic ions}{\textquotedblright}. Hellar-Kihampa H, De Wael K, Lugwisha E, Van Grieken R, International journal of river basin management \textbf{11}, 55 (2013).   http://doi.org/10.1080/15715124.2012.759119

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