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\bibitem{Reggers+VanGrieken1984} {\textquotedblleft}\textit{2,2'-Diaminodiethylamine cellulose powder for trace metal preconcentrations from water}{\textquotedblright}. Reggers C, Van Grieken R, Fresenius{\textquoteright} Zeitschrift f{\"u}r analytische Chemie \textbf{317}, 520 (1984).   http://doi.org/10.1007/BF00511918

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