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\bibitem{Margui_etal2009} {\textquotedblleft}\textit{Method for the determination of Pd-catalyst residues in active pharmaceutical ingredients by means of high-energy polarized-beam energy dispersive X-ray fluorescence}{\textquotedblright}. Margu{\'\i} E, van Meel K, Van Grieken R, Buend{\'\i}a A, Font{\'a}s C, Hidalgo M, Queralt I, Analytical chemistry \textbf{81}, 1404 (2009).   http://doi.org/10.1021/AC8021373

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