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\bibitem{Smits+VanGrieken1980} {\textquotedblleft}\textit{Characterization of a 2,2{\textquoteright}-diaminodiethylamine-cellulose filter toward metal cation extraction}{\textquotedblright}. Smits JA, Van Grieken RE, Analytical chemistry \textbf{52}, 1479 (1980).   http://doi.org/10.1021/AC50059A022

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