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\bibitem{Lubk_etal2013} {\textquotedblleft}\textit{Topological analysis of paraxially scattered electron vortex beams}{\textquotedblright}. Lubk A, Clark L, Guzzinati G, Verbeeck J, Physical review : A : atomic, molecular and optical physics \textbf{87}, 033834 (2013).   http://doi.org/10.1103/PhysRevA.87.033834

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