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\bibitem{Vos+VanGrieken1984} {\textquotedblleft}\textit{Influence of spark generator parameters in the analysis of graphite-electrodes by spark source-mass spectrometry}{\textquotedblright}. Vos L, Van Grieken R, International journal of mass spectrometry and ion processes \textbf{55}, 233 (1984).   http://doi.org/10.1016/0168-1176(84)87087-1

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