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\bibitem{Pierard_etal2004} {\textquotedblleft}\textit{Ball milling effect on the structure of single-wall carbon nanotubes}{\textquotedblright}. Pierard N, Fonseca A, Colomer J-F, Bossuot C, Benoit J-M, Van Tendeloo G, Pirard J-P, Nagy JB, Carbon \textbf{42}, 1691 (2004).   http://doi.org/10.1016/j.carbon.2004.02.031

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