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\bibitem{Bertoni+Calmels2006} {\textquotedblleft}\textit{First-principles calculation of the electronic structure and energy loss near edge spectra of chiral carbon nanotubes}{\textquotedblright}. Bertoni G, Calmels L, Micron \textbf{37}, 486 (2006).   http://doi.org/10.1016/j.micron.2005.10.011

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