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\bibitem{Kuczumov_etal1999} {\textquotedblleft}\textit{Application of auxiliary signals in X-ray fluorescence and electron microprobe analysis for density evaluation}{\textquotedblright}. Kuczumov A, Vekemans B, Schalm O, Vincze L, Dorrin{\'e} W, Gysels K, Van Grieken R, X-ray spectrometry \textbf{28}, 282 (1999).   http://doi.org/10.1002/(SICI)1097-4539(199907/08)28:4<282::AID-XRS352>3.0.CO;2-H

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