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\bibitem{Schelles_etal1995} {\textquotedblleft}\textit{Evaluation of secondary cathodes for glow discharge mass spectrometry analysis of different nonconducting sample types}{\textquotedblright}. Schelles W, de Gendt S, M{\"u}ller V, Van Grieken R, Applied spectroscopy \textbf{49}, 939 (1995).   http://doi.org/10.1366/0003702953964741

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