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\bibitem{Bliokh_etal2012} {\textquotedblleft}\textit{Electron vortex beams in a magnetic field : a new twist on Landau levels and Aharonov-Bohm states}{\textquotedblright}. Bliokh KY, Schattschneider P, Verbeeck J, Nori F, Physical review X \textbf{2}, 041011 (2012).   http://doi.org/10.1103/PhysRevX.2.041011

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