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\bibitem{Kruse_etal2006} {\textquotedblleft}\textit{Determination of the mean inner potential in III-V semiconductors, Si and Ge by density functional theory and electron holography}{\textquotedblright}. Kruse P, Schowalter M, Lamoen D, Rosenauer A, Gerthsen D, Ultramicroscopy \textbf{106}, 105 (2006).   http://doi.org/10.1016/j.ultramic.2005.06.057

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