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\bibitem{Ro_etal2000} {\textquotedblleft}\textit{Determination of chemical species in individual aerosol particles using ultrathin window EPMA}{\textquotedblright}. Ro C-U, Os{\'a}n J, Szal{\'o}ki I, Oh K-Y, Kim H, Van Grieken R, Environmental science and technology \textbf{34}, 3023 (2000).   http://doi.org/10.1021/ES9910661

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