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\bibitem{Ning_etal2002} {\textquotedblleft}\textit{Bulk production of multi-wall carbon nanotube bundles on sol-gel prepared catalyst}{\textquotedblright}. Ning Y, Zhang X, Wang Y, Sun Y, Shen L, Yang X, Van Tendeloo G, Chemical physics letters \textbf{366}, 555 (2002).   http://doi.org/10.1016/S0009-2614(02)01647-0

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