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\bibitem{Rojas_etal1993} {\textquotedblleft}\textit{Elemental composition of aircraft-sampled aerosols above the Southern Bight of the North Sea}{\textquotedblright}. Rojas CM, Van Grieken R, Maenhaut W, Water, air and soil pollution \textbf{71}, 391 (1993).   http://doi.org/10.1007/BF00480557

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