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\bibitem{Margui_etal2012} {\textquotedblleft}\textit{Analytical capabilities of laboratory, benchtop and handheld X-ray fluorescence systems for detection of metals in aqueous samples pre-concentrated with solid-phase extraction disks}{\textquotedblright}. Margui E, Hidalgo M, Queralt I, van Meel K, Fontas C, Spectrochimica acta: part B : atomic spectroscopy \textbf{67}, 17 (2012).   http://doi.org/10.1016/J.SAB.2011.12.004

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