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\bibitem{Schelles+VanGrieken1996} {\textquotedblleft}\textit{Direct current glow discharge mass spectrometric analysis of Macor ceramic using a secondary cathode}{\textquotedblright}. Schelles W, Van Grieken R, Analytical chemistry \textbf{68}, 3570 (1996).   http://doi.org/10.1021/AC960441U

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