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\bibitem{Idris_etal2007} {\textquotedblleft}\textit{Assessment of heavy metals pollution in Sudanese harbours along the Red Sea Coast}{\textquotedblright}. Idris AM, Eltayeb MAH, Potgieter-Vermaak SS, Van Grieken R, Potgieter JH, Microchemical journal \textbf{87}, 104 (2007).   http://doi.org/10.1016/J.MICROC.2007.06.004

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