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\bibitem{Schelles+VanGrieken1997} {\textquotedblleft}\textit{Direct current glow discharge mass spectrometry for elemental characterization of polymers}{\textquotedblright}. Schelles W, Van Grieken R, Analytical chemistry \textbf{69}, 2931 (1997).   http://doi.org/10.1021/AC970186T

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