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\bibitem{Toeroek_etal1984} {\textquotedblleft}\textit{Heterogeneity effects in direct X-ray fluorescence analysis of hair}{\textquotedblright}. T{\"o}r{\"o}k S, Van Dyck P, Van Grieken R, X-ray spectrometry \textbf{13}, 27 (1984).   http://doi.org/10.1002/XRS.1300130106

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