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\bibitem{Pennycook_etal2019} {\textquotedblleft}\textit{Efficient Phase Contrast Imaging via Electron Ptychography, a Tutorial}{\textquotedblright}. Pennycook TJ, Martinez GT, O{\textquoteright}Leary CM, Yang H, Nellist PD, Microscopy and microanalysis \textbf{25}, 2684 (2019).   http://doi.org/10.1017/S1431927619014156

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