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\bibitem{Zhang_etal1994} {\textquotedblleft}\textit{A simple preparation method for air-sensitive specimens for transmission electron microscopy demonstrated by Rb$_{6}$C$_{60}$}{\textquotedblright}. Zhang XF, Zhang XB, Bernaerts D, Van Tendeloo G, Amelinckx S, van Landuyt J, Werner H, Ultramicroscopy \textbf{55}, 25 (1994).   http://doi.org/10.1016/0304-3991(94)90077-9

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