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\bibitem{Guzzinati_etal2013} {\textquotedblleft}\textit{Observation of the Larmor and Gouy rotations with electron vortex beams}{\textquotedblright}. Guzzinati G, Schattschneider P, Bliokh KY, Nori F, Verbeeck J, Physical review letters \textbf{110}, 093601 (2013).   http://doi.org/10.1103/PhysRevLett.110.093601

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