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\bibitem{Colomer_etal2004} {\textquotedblleft}\textit{Bundles of identical double-walled carbon nanotubes}{\textquotedblright}. Colomer J-F, Henrard L, Launois P, Van Tendeloo G, Lucas AA, Lambin P, Chemical communications , 2592 (2004).   http://doi.org/10.1039/b410930a

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