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\bibitem{VanGrieken+Adams1976} {\textquotedblleft}\textit{Folding of aerosol loaded filters during X-ray fluorescence analysis}{\textquotedblright}. Van Grieken RE, Adams FC, X-ray spectrometry \textbf{5}, 61 (1976).   http://doi.org/10.1002/XRS.1300050204

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