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\bibitem{Muia+VanGrieken1989} {\textquotedblleft}\textit{Theoretical evaluation of the effective alpha and De Jongh approaches in X-ray fluorescence analysis of geological materials in borax glass beads}{\textquotedblright}. Muia LM, Van Grieken R, X-ray spectrometry \textbf{18}, 259 (1989).   http://doi.org/10.1002/XRS.1300180604

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