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\bibitem{Li_etal2004} {\textquotedblleft}\textit{Controlling the diameters in large-scale synthesis of single-walled carbon nanotubes by catalytic decomposition of CH$_{4}$}{\textquotedblright}. Li Y, Zhang X, Shen L, Luo J, Tao X, Liu F, Xu G, Wang Y, Geise HJ, Van Tendeloo G, Chemical physics letters \textbf{398}, 276 (2004).   http://doi.org/10.1016/j.cplett.2004.09.068

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