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\bibitem{Trincavelli_etal1993} {\textquotedblleft}\textit{M\alpha/L\alpha intensity ratios for Ta, W, Pt, Au, Pb and Bi for electron energies in the 11-40 keV range}{\textquotedblright}. Trincavelli J, Montoro S, van Espen P, Van Grieken R, X-ray spectrometry \textbf{22}, 372 (1993).   http://doi.org/10.1002/XRS.1300220510

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