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\bibitem{Bernaerts_etal1996} {\textquotedblleft}\textit{The chirality of carbon nanotubules determined by dark-field electron microscopy}{\textquotedblright}. Bernaerts D, op de Beeck M, Amelinckx S, van Landuyt J, Van Tendeloo G, Philosophical magazine: A: physics of condensed matter: defects and mechanical properties \textbf{74}, 723 (1996).   http://doi.org/10.1080/01418619608243538

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