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\bibitem{Pierard_etal2001} {\textquotedblleft}\textit{Production of short carbon nanotubes with open tips by ball milling}{\textquotedblright}. Pierard N, Fonseca A, Konya Z, Willems I, Van Tendeloo G, Nagy JB, Chemical physics letters \textbf{335}, 1 (2001).   http://doi.org/10.1016/S0009-2614(01)00004-5

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