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\bibitem{Juchtmans_etal2016} {\textquotedblleft}\textit{Spiral phase plate contrast in optical and electron microscopy}{\textquotedblright}. Juchtmans R, Clark L, Lubk A, Verbeeck J, Physical review A \textbf{94}, 023838 (2016).   http://doi.org/10.1103/PhysRevA.94.023838

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