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\bibitem{Tsuji_etal1999} {\textquotedblleft}\textit{Grazing-exit particle-induced X-ray emission analysis with extremely low background}{\textquotedblright}. Tsuji K, Spolnik Z, Wagatsuma K, Van Grieken RE, Vis RD, Analytical chemistry \textbf{71}, 5033 (1999).   http://doi.org/10.1021/AC990568U

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