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\bibitem{Verbeeck_etal2012} {\textquotedblleft}\textit{A new way of producing electron vortex probes for STEM}{\textquotedblright}. Verbeeck J, Tian H, B{\'e}ch{\'e} A, Ultramicroscopy \textbf{113}, 83 (2012).   http://doi.org/10.1016/j.ultramic.2011.10.008

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