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\bibitem{Cidu_etal1994} {\textquotedblleft}\textit{Determination of gold at the ultratrace level in natural waters}{\textquotedblright}. Cidu R, Fanfani L, Shaud P, Edmunds WM, Van {\textquoteright}t dack L, Gijbels R, Analytica chimica acta \textbf{296}, 295 (1994).   http://doi.org/10.1016/0003-2670(94)80249-1

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