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\bibitem{Bliokh_etal2017} {\textquotedblleft}\textit{Theory and applications of free-electron vortex states}{\textquotedblright}. Bliokh KY, Ivanov IP, Guzzinati G, Clark L, Van~Boxem R, B{\'e}ch{\'e} A, Juchtmans R, Alonso MA, Schattschneider P, Nori F, Verbeeck J, Physics reports \textbf{690}, 1 (2017).   http://doi.org/10.1016/j.physrep.2017.05.006

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