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\bibitem{Vos_etal1981} {\textquotedblleft}\textit{Multi-element analysis of urine by energy-dispersive x-ray fluorescence spectrometry}{\textquotedblright}. Vos L, Robberecht H, Van Dyck P, Van Grieken R, Analytica chimica acta \textbf{130}, 167 (1981).   http://doi.org/10.1016/S0003-2670(01)84161-1

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