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\bibitem{Willems_etal2000} {\textquotedblleft}\textit{Control of the outer diameter of thin carbon nanotubes synthesized by catalytic decomposition of hydrocarbons}{\textquotedblright}. Willems I, Konya Z, Colomer JF, Van Tendeloo G, Nagaraju N, Fonseca A, Nagy JB, Chemical physics letters \textbf{317}, 71 (2000).   http://doi.org/10.1016/S0009-2614(99)01300-7

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