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\bibitem{Hoornaert_etal1999} {\textquotedblleft}\textit{Trend analysis of the published concentrations of heavy metals in aerosols above the North Sea and the English Channel for the period 1971-1994}{\textquotedblright}. Hoornaert S, Treiger B, Van Grieken R, Laane R, Environmental reviews \textbf{7}, 191 (1999)

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