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\bibitem{Smits+VanGrieken1978} {\textquotedblleft}\textit{Synthesis of a chelating cellulose filter with 2,2-diaminodiethylamine functional groups}{\textquotedblright}. Smits J, Van Grieken R, Zeitschrift f{\"u}r angewandte Makromolekare Chemie \textbf{72}, 105 (1978)

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