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\bibitem{Zhang_etal1994} {\textquotedblleft}\textit{The texture of catalytically grown coil-shaped carbon nanotubes}{\textquotedblright}. Zhang XB, Zhang XF, Bernaerts D, Van Tendeloo G, Amelinckx S, van Landuyt J, Ivanov V, Nagy JB, Lambin P, Lucas AA, Europhysics letters \textbf{27}, 141 (1994).   http://doi.org/10.1209/0295-5075/27/2/011

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