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\bibitem{Roet+vanEspen2010} {\textquotedblleft}\textit{Monte Carlo simulation of X-ray spectra from low energy electrons using optical data}{\textquotedblright}. Roet D, van Espen P, Nuclear instruments and methods in physics research: B: beam interactions with materials and atoms \textbf{268}, 2794 (2010).   http://doi.org/10.1016/J.NIMB.2010.07.004

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