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\bibitem{Bruynseels_etal1988} {\textquotedblleft}\textit{Inorganic nitrogen speciation in single micrometer-size particles by laser microprobe mass analysis}{\textquotedblright}. Bruynseels F, Otten P, Van Grieken R, Journal of analytical atomic spectrometry \textbf{3}, 237 (1988).   http://doi.org/10.1039/JA9880300237

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