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\bibitem{VanDyck_etal1985} {\textquotedblleft}\textit{Influence of sample thickness, excitation energy and geometry on particle size effects in XRF}{\textquotedblright}. Van Dyck P, Markowicz A, Van Grieken R, X-ray spectrometry \textbf{14}, 183 (1985).   http://doi.org/10.1002/XRS.1300140409

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