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\bibitem{Bernaerts_etal1994} {\textquotedblleft}\textit{HREM study of Rb$_{6}$C$_{60}$ and helical carbon nanotubules}{\textquotedblright}. Bernaerts D, Zhang XB, Zhang XF, Van Tendeloo G, van Landuyt J, Amelinckx S, Icem \textbf{13}, 305 (1994)

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