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\bibitem{VanGrieken_etal1980} {\textquotedblleft}\textit{Sample contamination from a commercial grinding unit}{\textquotedblright}. Van Grieken R, Van de Velde R, Robberecht H, Analytica chimica acta \textbf{118}, 137 (1980).   http://doi.org/10.1016/S0003-2670(01)93724-9

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