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\bibitem{Croitoru_etal2008} {\textquotedblleft}\textit{Measurement of specimen thickness by phase change determination in TEM}{\textquotedblright}. Croitoru MD, van Dyck D, Liu YZ, Zhang Z, Ultramicroscopy \textbf{108}, 1616 (2008).   http://doi.org/10.1016/j.ultramic.2008.06.002

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