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\bibitem{Eltayeb+VanGrieken1992} {\textquotedblleft}\textit{Coprecipitation with aluminium hydroxide and x-ray fluorescence determination of trace metals in water}{\textquotedblright}. Eltayeb MAH, Van Grieken RE, Analytica chimica acta \textbf{268}, 177 (1992).   http://doi.org/10.1016/0003-2670(92)85262-5

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