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\bibitem{Bals_etal2005} {\textquotedblleft}\textit{Nonlinear imaging using annular dark field TEM}{\textquotedblright}. Bals S, Kilaas R, Kisielowski C, Ultramicroscopy \textbf{104}, 281 (2005).   http://doi.org/10.1016/j.ultramic.2005.05.004

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