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\bibitem{Vos+VanGrieken1983} {\textquotedblleft}\textit{Influence of ion energy-distributions and matrix effects on spark source-mass spectrometric analysis}{\textquotedblright}. Vos L, Van Grieken R, International journal of mass spectrometry and ion processes \textbf{51}, 63 (1983).   http://doi.org/10.1016/0020-7381(83)85029-3

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