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\bibitem{Verbeeck_etal2011} {\textquotedblleft}\textit{A holographic biprism as a perfect energy filter?}{\textquotedblright}.Verbeeck J, Bertoni G, Lichte H, Ultramicroscopy \textbf{111}, 887 (2011).   http://doi.org/10.1016/j.ultramic.2011.01.042

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