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\bibitem{Colomer_etal2004} {\textquotedblleft}\textit{Study of the packing of double-walled carbon nanotubes into bundles by transmission electron microscopy and electron diffraction}{\textquotedblright}. Colomer J-F, Henrard L, Van Tendeloo G, Lucas A, Lambin P, Journal of materials chemistry \textbf{14}, 603 (2004).   http://doi.org/10.1039/b311551h

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