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\bibitem{Geuens_etal1991} {\textquotedblleft}\textit{The primary energy dependence of backscattered electron images up to 100 keV}{\textquotedblright}. Geuens I, Nys B, Naudts J, Gijbels R, Jacob W, van Espen P, Scanning microscopy \textbf{5}, 339 (1991)

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