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\bibitem{Beche_etal2015} {\textquotedblleft}\textit{Focused electron beam induced deposition as a tool to create electron vortices}{\textquotedblright}. B{\'e}ch{\'e} A, Winkler R, Plank H, Hofer F, Verbeeck J, Micron \textbf{80}, 34 (2015).   http://doi.org/10.1016/j.micron.2015.07.011

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