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\bibitem{Claes_etal1997} {\textquotedblleft}\textit{Optimization of sample preparation for grazing emission X-ray fluorescence in micro- and trace analysis applications}{\textquotedblright}. Claes M, de Bokx P, Willard N, Veny P, Van Grieken R, Spectrochimica acta: part B : atomic spectroscopy \textbf{52}, 1063 (1997).   http://doi.org/10.1016/S0584-8547(96)01654-0

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