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\bibitem{Civici+VanGrieken1997} {\textquotedblleft}\textit{Energy-dispersive X-ray fluorescence in geochemical mapping}{\textquotedblright}. Civici N, Van Grieken R, X-ray spectrometry \textbf{26}, 147 (1997).   http://doi.org/10.1002/(SICI)1097-4539(199707)26:4<147::AID-XRS193>3.0.CO;2-X

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