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\bibitem{Choel_etal2005} {\textquotedblleft}\textit{Quantitative determination of low-Z elements in single atmospheric particles on boron substrates by automated scanning electron microscopy: energy-dispersive X-ray spectrometry}{\textquotedblright}. Cho{\"e}l M, Deboudt K, Os{\'a}n J, Flament P, Van Grieken R, Analytical chemistry \textbf{77}, 5686 (2005).   http://doi.org/10.1021/AC050739X

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