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\bibitem{Verbeeck_etal2011} {\textquotedblleft}\textit{Atomic scale electron vortices for nanoresearch}{\textquotedblright}. Verbeeck J, Schattschneider P, Lazar S, St{\"o}ger-Pollach M, L{\"o}ffler S, Steiger-Thirsfeld A, Van Tendeloo G, Applied physics letters \textbf{99}, 203109 (2011).   http://doi.org/10.1063/1.3662012

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