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\bibitem{Hoornaert_etal1996} {\textquotedblleft}\textit{Gypsum and other calcium-rich particles above the North Sea}{\textquotedblright}. Hoornaert S, van Malderen H, Van Grieken R, Environmental science and technology \textbf{30}, 1515 (1996).   http://doi.org/10.1021/ES9504350

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