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\bibitem{Markowicz_etal1986} {\textquotedblleft}\textit{Evaluation of an equation for bremsstrahlung background in electron-probe X-ray microanalysis of composite samples}{\textquotedblright}. Markowicz A, Storms H, Van Grieken R, X-ray spectrometry \textbf{15}, 131 (1986).   http://doi.org/10.1002/XRS.1300150211

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