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\bibitem{Schattschneider_etal2012} {\textquotedblleft}\textit{Sub-nanometer free electrons with topological charge}{\textquotedblright}. Schattschneider P, St{\"o}ger-Pollach M, L{\"o}ffler S, Steiger-Thirsfeld A, Hell J, Verbeeck J, Ultramicroscopy \textbf{115}, 21 (2012).   http://doi.org/10.1016/j.ultramic.2012.01.010

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