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\bibitem{Verbeeck_etal2018} {\textquotedblleft}\textit{Demonstration of a 2 {\texttimes} 2 programmable phase plate for electrons}{\textquotedblright}. Verbeeck J, B{\'e}ch{\'e} A, M{\"u}ller-Caspary K, Guzzinati G, Luong MA, Den Hertog M, Ultramicroscopy \textbf{190}, 58 (2018).   http://doi.org/10.1016/j.ultramic.2018.03.017

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