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\bibitem{Padilla_etal2005} {\textquotedblleft}\textit{Semiempirical approach for standardless calibration in {\textmu}-XRF spectrometry using capillary lenses}{\textquotedblright}. Padilla R, van Espen P, Abrahantes A, Janssens K, X-ray spectrometry \textbf{34}, 19 (2005).   http://doi.org/10.1002/XRS.781

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