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\bibitem{Clark_etal2013} {\textquotedblleft}\textit{Exploiting lens aberrations to create electron-vortex beams}{\textquotedblright}. Clark L, B{\'e}ch{\'e} A, Guzzinati G, Lubk A, Mazilu M, Van Boxem R, Verbeeck J, Physical review letters \textbf{111}, 064801 (2013).   http://doi.org/10.1103/PhysRevLett.111.064801

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