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\bibitem{vanMalderen_etal1996} {\textquotedblleft}\textit{Identification of individual aerosol particles containing Cr, Pb, and Zn above the North Sea}{\textquotedblright}. van Malderen H, Hoornaert S, Van Grieken R, Environmental science and technology \textbf{30}, 489 (1996).   http://doi.org/10.1021/ES950205L

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