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\bibitem{Maenhaut_etal1981} {\textquotedblleft}\textit{Pixe analysis of aerosol samples collected over the atlantic-ocean from a sailboat}{\textquotedblright}. Maenhaut W, Selen A, van Espen P, Van Grieken R, Winchester WJ, Nuclear instruments and methods \textbf{181}, 399 (1981).   http://doi.org/10.1016/0029-554X(81)90640-6

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