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\bibitem{Margui_etal2010} {\textquotedblleft}\textit{Preconcentration methods for the analysis of liquid samples by X-ray fluorescence techniques}{\textquotedblright}. Margu{\'\i} E, Van Grieken R, Font{\`a}s C, Hidalgo M, Queralt I, Applied spectroscopy reviews \textbf{45}, 179 (2010).   http://doi.org/10.1080/05704920903584198

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