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\bibitem{Samek_etal2006} {\textquotedblleft}\textit{Speciation of selected metals in aerosol samples by TXRF after sequential leaching}{\textquotedblright}. Samek L, Ostachowicz B, Worobiec A, Spolnik Z, Van Grieken R, X-ray spectrometry \textbf{35}, 226 (2006).   http://doi.org/10.1002/XRS.905

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