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\bibitem{Clark_etal2014} {\textquotedblleft}\textit{Quantitative measurement of orbital angular momentum in electron microscopy}{\textquotedblright}. Clark L, B{\'e}ch{\'e} A, Guzzinati G, Verbeeck J, Physical review : A : atomic, molecular and optical physics \textbf{89}, 053818 (2014).   http://doi.org/10.1103/PhysRevA.89.053818

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