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\bibitem{Schelles_etal1996} {\textquotedblleft}\textit{Optimization of secondary cathode thickness for direct current glow discharge mass spectrometric analysis of glass}{\textquotedblright}. Schelles W, de Gendt S, Van Grieken RE, Journal of analytical atomic spectrometry \textbf{11}, 937 (1996).   http://doi.org/10.1039/JA9961100937

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