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\bibitem{Margui_etal2006} {\textquotedblleft}\textit{High-energy polarized-beam EDXRF for trace metal analysis of vegetation samples in environmental studies}{\textquotedblright}. Margu{\'\i} E, Padilla R, Hidalgo M, Queralt I, Van Grieken R, X-ray spectrometry \textbf{35}, 169 (2006).   http://doi.org/10.1002/XRS.890

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