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\bibitem{Rojas+VanGrieken1992} {\textquotedblleft}\textit{Electron microprobe characterization of individual aerosol particles collected by aircraft above the Southern Bight of the North Sea}{\textquotedblright}. Rojas CM, Van Grieken RE, Atmospheric environment : an international journal \textbf{26a}, 1231 (1992).   http://doi.org/10.1016/0960-1686(92)90384-W

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