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\bibitem{Vos+VanGrieken1985} {\textquotedblleft}\textit{Matrix effects and analysis of biological material by spark source mass spectrometry}{\textquotedblright}. Vos L, Van Grieken R, Fresenius{\textquoteright} Zeitschrift f{\"u}r analytische Chemie \textbf{321}, 32 (1985).   http://doi.org/10.1007/BF00464483

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