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\bibitem{Bernaerts_etal1994} {\textquotedblleft}\textit{HREM study of Rb6C60 and helical shaped carbon nanotubules}{\textquotedblright}. Bernaerts D, Zhang X, Zhang X, Van Tendeloo G, Vanlanduyt J, Amelinckx S, Sciences , 305 (1994)

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